diff --git a/assets/main.js b/assets/main.js
index ef2a104..5aa0164 100644
--- a/assets/main.js
+++ b/assets/main.js
@@ -30,6 +30,7 @@ let permissionOriginal = "";
 let permissionBusy = false;
 let downloadFrame = null;
 let uploadXhr = null;
+let uploadTerminalAbort = false;
 let L = {};
 
 const APP_VERSION = "v1.6";
@@ -458,6 +459,10 @@ function clearTrackedTask() {
     downloadFrame.parentNode.removeChild(downloadFrame);
     downloadFrame = null;
   }
+  if (trackedTask && trackedTask.op === "upload" && uploadXhr) {
+    uploadTerminalAbort = true;
+    uploadXhr.abort();
+  }
   trackedTask = null;
 }
 
@@ -1798,8 +1803,11 @@ function renderTasks(tasks) {
     if (confirm(t("cancelTaskConfirm", { label: opLabel(task.op) }))) {
       requestTaskCancel(task.id);
       api("/api/cancel", { id: task.id }).then(() => {
-        if (task.op === "upload" && uploadXhr) uploadXhr.abort();
-        return pollTasks();
+        if (task.op !== "upload") return pollTasks();
+        if (uploadXhr) uploadXhr.abort();
+        return api("/api/upload/finish", { task_id: task.id })
+          .catch(() => {})
+          .then(pollTasks);
       }).catch(err => {
         if (trackedTask && trackedTask.id === task.id) trackedTask.cancelRequested = false;
         setStatus(t("cancelFailed", { error: err.message }));
@@ -1941,7 +1949,7 @@ function uploadConflicts(rels) {
   return conflicts;
 }
 
-function uploadFileRequest(taskId, file, rel, overwrite) {
+function uploadFileRequest(taskId, file, rel, overwrite, index) {
   return new Promise((resolve, reject) => {
     const xhr = new XMLHttpRequest();
     uploadXhr = xhr;
@@ -1967,12 +1975,25 @@ function uploadFileRequest(taskId, file, rel, overwrite) {
     };
     xhr.onerror = () => {
       uploadXhr = null;
-      reject(new Error(xhr.statusText || t("backendError")));
+      const error = new Error(xhr.statusText || t("backendError"));
+      api("/api/tasks").then(data => {
+        const task = (data.tasks || []).find(item => item.id === taskId);
+        if (task && Number(task.completed_count || 0) >= index) {
+          resolve();
+        } else if (task && task.state === "failed") {
+          reject(new Error(backendErrorText(task.error_code, task.error_arg,
+            task.error || task.current)));
+        } else {
+          reject(error);
+        }
+      }).catch(() => reject(error));
     };
     xhr.onabort = () => {
       uploadXhr = null;
+      const terminal = uploadTerminalAbort;
+      uploadTerminalAbort = false;
       const err = new Error("aborted");
-      err.name = "AbortError";
+      err.name = terminal ? "TerminalTaskAbort" : "AbortError";
       reject(err);
     };
     xhr.send(file);
@@ -2030,21 +2051,32 @@ async function uploadFiles(files) {
       const file = list[i];
       const rel = rels[i];
       setStatus(t("uploadingStatus", { index: i + 1, count: list.length, name: rel }));
-      await uploadFileRequest(taskId, file, rel, overwrite);
+      await uploadFileRequest(taskId, file, rel, overwrite, i + 1);
     }
     await api("/api/upload/finish", { task_id: taskId });
     await pollTasks();
     setStatus(t("uploadDone", { count: list.length }));
   } catch (err) {
+    const terminalAbort = err && err.name === "TerminalTaskAbort";
     const canceled = err && err.name === "AbortError";
-    if (canceled) {
-      setStatus(t("taskCanceled", { label: opLabel("upload") }));
-    } else {
-      const message = t("uploadFailed", { error: err.message });
-      setStatus(message);
-      alert(message);
+    if (!terminalAbort) {
+      if (taskId) {
+        try {
+          await api("/api/cancel", { id: taskId });
+          await api("/api/upload/finish", { task_id: taskId });
+        } catch (cancelErr) {
+          /* The server may already have moved a failed upload to a terminal state. */
+        }
+      }
+      await pollTasks();
+      if (canceled) {
+        setStatus(t("taskCanceled", { label: opLabel("upload") }));
+      } else {
+        const message = t("uploadFailed", { error: err.message });
+        setStatus(message);
+        alert(message);
+      }
     }
-    await pollTasks();
   } finally {
     uploadXhr = null;
     uploadFilesEl.value = "";
diff --git a/src/filemgr.c b/src/filemgr.c
index 74364c4..b761de0 100644
--- a/src/filemgr.c
+++ b/src/filemgr.c
@@ -1853,8 +1853,9 @@ api_tasks(struct MHD_Connection *conn) {
     json_escape(&b, task->error_code);
     strbuf_append(&b, ",\"error_arg\":");
     json_escape(&b, task->error_arg);
-    strbuf_printf(&b, ",\"src_count\":%zu,\"total\":%llu,\"done\":%llu,\"speed\":%llu,\"eta\":%llu,\"cancel_requested\":%s,\"created_at\":%lld,\"elapsed\":%lld,\"total_elapsed\":%lld,\"updated_at\":%lld}",
-                  task->src_count, task->total, task->done, task->speed, task->eta,
+    strbuf_printf(&b, ",\"src_count\":%zu,\"completed_count\":%zu,\"total\":%llu,\"done\":%llu,\"speed\":%llu,\"eta\":%llu,\"cancel_requested\":%s,\"created_at\":%lld,\"elapsed\":%lld,\"total_elapsed\":%lld,\"updated_at\":%lld}",
+                  task->src_count, task->upload_completed,
+                  task->total, task->done, task->speed, task->eta,
                   task->cancel_requested ? "true" : "false",
                   (long long)task->created_at,
                   task->transfer_started_at ? (long long)(now - task->transfer_started_at) : 0LL,
diff --git a/src/filemgr_internal.h b/src/filemgr_internal.h
index ffc1a3f..0465a43 100644
--- a/src/filemgr_internal.h
+++ b/src/filemgr_internal.h
@@ -45,6 +45,7 @@ typedef struct file_task {
   size_t src_count;
   size_t file_count;
   size_t dir_count;
+  size_t upload_completed;
   unsigned int chmod_mode;
   int recursive;
   unsigned long long total;
@@ -57,6 +58,7 @@ typedef struct file_task {
   unsigned int eta_sample_next;
   unsigned int eta_sample_count;
   int cancel_requested;
+  unsigned int active_streams;
   time_t created_at;
   time_t transfer_started_at;
   time_t updated_at;
diff --git a/src/pkg_installer.c b/src/pkg_installer.c
index 1455cf3..212d477 100644
--- a/src/pkg_installer.c
+++ b/src/pkg_installer.c
@@ -4,6 +4,7 @@
 
 #include <limits.h>
 #include <pthread.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <string.h>
 
@@ -14,8 +15,13 @@ typedef struct pkg_metadata {
   const char *content_id;
   const char *content_name;
   const char *icon_url;
+  uint32_t slot;
+  uint32_t is_playgo_enabled;
 } pkg_metadata_t;
 
+_Static_assert(sizeof(pkg_metadata_t) == 0x38,
+               "sceAppInstUtil metadata ABI mismatch");
+
 typedef struct pkg_info {
   char content_id[48];
   int type;
@@ -23,12 +29,15 @@ typedef struct pkg_info {
 } pkg_info_t;
 
 typedef struct playgo_info {
-  char lang[8][30];
-  char scenario_ids[3][64];
-  char content_ids[64];
+  char languages[30][8];
+  char scenario_ids[64][3];
+  char content_ids[64][48];
   long unknown[810];
 } playgo_info_t;
 
+_Static_assert(sizeof(playgo_info_t) == 0x2700,
+               "sceAppInstUtil PlayGoInfo ABI mismatch");
+
 int sceAppInstUtilInitialize(void);
 int sceAppInstUtilInstallByPackage(const pkg_metadata_t *, pkg_info_t *,
                                    playgo_info_t *);
@@ -68,7 +77,9 @@ pkg_installer_install(const char *path) {
     .playgo_scenario_id = "",
     .content_id = "",
     .content_name = "",
-    .icon_url = ""
+    .icon_url = "",
+    .slot = 0,
+    .is_playgo_enabled = 0
   };
   pkg_info_t pkg_info = {0};
   playgo_info_t playgo_info = {0};
diff --git a/src/task.c b/src/task.c
index e61c548..84b639c 100644
--- a/src/task.c
+++ b/src/task.c
@@ -82,7 +82,7 @@ remove_finished_tasks_locked(void) {
   while(*link) {
     file_task_t *task = *link;
 
-    if(task_is_active(task)) {
+    if(task_is_active(task) || task->active_streams) {
       link = &task->next;
       continue;
     }
diff --git a/src/upload.c b/src/upload.c
index 89828c7..2c5743c 100644
--- a/src/upload.c
+++ b/src/upload.c
@@ -28,8 +28,22 @@ typedef struct upload_context {
   int failed;
   int error;
   int task_done;
+  const char *stage;
+  char error_message[256];
 } upload_context_t;
 
+static const char *
+upload_error_message(upload_context_t *ctx) {
+  if(!ctx->error_message[0]) {
+    snprintf(ctx->error_message, sizeof(ctx->error_message), "%s failed%s%s: %s",
+             ctx->stage ? ctx->stage : "upload",
+             ctx->target[0] ? " for " : "",
+             ctx->target[0] ? ctx->target : "",
+             strerror(ctx->error ? ctx->error : EIO));
+  }
+  return ctx->error_message;
+}
+
 static int
 upload_flush(upload_context_t *ctx) {
   size_t written = 0;
@@ -81,11 +95,29 @@ finish_upload_task(file_task_t *task, task_state_t state, const char *current,
     if(error) {
       snprintf(task->error, sizeof(task->error), "%s", error);
     }
+    if(state == TASK_FAILED) {
+      snprintf(task->error_code, sizeof(task->error_code), "upload_failed");
+      snprintf(task->error_arg, sizeof(task->error_arg), "%s",
+               current ? current : task->src);
+    }
     task->updated_at = completed_at;
   }
   pthread_mutex_unlock(&g_tasks_lock);
 }
 
+static void
+finish_upload_context_error(upload_context_t *ctx) {
+  if(!ctx->task || ctx->task_done) {
+    return;
+  }
+  upload_error_message(ctx);
+  finish_upload_task(ctx->task,
+                     ctx->error == ECANCELED ? TASK_CANCELED : TASK_FAILED,
+                     ctx->target[0] ? ctx->target : ctx->task->current,
+                     ctx->error == ECANCELED ? "canceled" : ctx->error_message);
+  ctx->task_done = 1;
+}
+
 static file_task_t *
 upload_task_from_conn(struct MHD_Connection *conn) {
   char *idstr = request_value(conn, "X-WFM-Task-ID", "task_id");
@@ -300,12 +332,18 @@ filemgr_upload_begin(struct MHD_Connection *conn, void **upload_ctx) {
     return -1;
   }
   ctx->fd = -1;
+  ctx->stage = "preparing upload";
   *upload_ctx = ctx;
 
   if(size_text) {
     ctx->expected = strtoull(size_text, NULL, 10);
   }
   ctx->task = task;
+  if(task) {
+    pthread_mutex_lock(&g_tasks_lock);
+    task->active_streams++;
+    pthread_mutex_unlock(&g_tasks_lock);
+  }
   if(task && task_cancel_requested(task)) {
     ctx->failed = 1;
     ctx->error = ECANCELED;
@@ -316,17 +354,20 @@ filemgr_upload_begin(struct MHD_Connection *conn, void **upload_ctx) {
     ctx->error = EBUSY;
     goto fail;
   }
+  ctx->stage = "validating target path";
   if(!base || !rel || path_join_relative(ctx->target, sizeof(ctx->target),
                                          base, rel)) {
     ctx->failed = 1;
     ctx->error = errno ? errno : EINVAL;
     goto fail;
   }
+  ctx->stage = "creating target folders";
   if(ensure_parent_dirs(base, rel)) {
     ctx->failed = 1;
     ctx->error = errno ? errno : EACCES;
     goto fail;
   }
+  ctx->stage = "checking target path";
   if(!lstat(ctx->target, &st)) {
     if(S_ISDIR(st.st_mode) || !overwrite || strcmp(overwrite, "1")) {
       ctx->failed = 1;
@@ -338,19 +379,26 @@ filemgr_upload_begin(struct MHD_Connection *conn, void **upload_ctx) {
     ctx->error = errno;
     goto fail;
   }
+  ctx->stage = "checking target permissions";
   if(check_target_writable(ctx->target, &checked_dirs, &checked_dir_count,
                            error, sizeof(error), code, sizeof(code),
                            arg, sizeof(arg))) {
+    snprintf(ctx->error_message, sizeof(ctx->error_message), "%s",
+             error[0] ? error : "target is not writable");
     ctx->failed = 1;
     ctx->error = errno ? errno : EACCES;
     goto fail;
   }
+  ctx->stage = "checking target space";
   if(check_target_space(ctx->target, ctx->expected, error, sizeof(error),
                         code, sizeof(code), arg, sizeof(arg))) {
+    snprintf(ctx->error_message, sizeof(ctx->error_message), "%s",
+             error[0] ? error : "not enough target space");
     ctx->failed = 1;
     ctx->error = errno ? errno : ENOSPC;
     goto fail;
   }
+  ctx->stage = "creating temporary path";
   n = snprintf(ctx->temp, sizeof(ctx->temp), "%s.wfm-upload-%ld-%lld.tmp",
                ctx->target, (long)getpid(), (long long)time(NULL));
   if(n < 0 || (size_t)n >= sizeof(ctx->temp)) {
@@ -358,12 +406,14 @@ filemgr_upload_begin(struct MHD_Connection *conn, void **upload_ctx) {
     ctx->error = ENAMETOOLONG;
     goto fail;
   }
+  ctx->stage = "opening temporary file";
   ctx->fd = open(ctx->temp, O_WRONLY | O_CREAT | O_TRUNC, 0600);
   if(ctx->fd < 0) {
     ctx->failed = 1;
     ctx->error = errno;
     goto fail;
   }
+  ctx->stage = "allocating upload buffer";
   if(!(ctx->buffer = malloc(UPLOAD_BUFFER_SIZE))) {
     ctx->failed = 1;
     ctx->error = ENOMEM;
@@ -374,13 +424,7 @@ fail:
   free_paths(checked_dirs, checked_dir_count);
   free(base); free(rel); free(overwrite); free(size_text);
   if(ctx->failed) {
-    if(ctx->task) {
-      finish_upload_task(ctx->task,
-                         ctx->error == ECANCELED ? TASK_CANCELED : TASK_FAILED,
-                         ctx->target[0] ? ctx->target : ctx->task->current,
-                         ctx->error == ECANCELED ? "canceled" : strerror(ctx->error ? ctx->error : EIO));
-      ctx->task_done = 1;
-    }
+    finish_upload_context_error(ctx);
     if(ctx->fd >= 0) {
       close(ctx->fd);
       ctx->fd = -1;
@@ -391,6 +435,7 @@ fail:
     errno = ctx->error ? ctx->error : EIO;
     return -1;
   }
+  ctx->stage = "writing file";
   return 0;
 }
 
@@ -404,6 +449,7 @@ filemgr_upload_data(void *upload_ctx, const char *data, size_t size) {
   if(ctx->task && task_cancel_requested(ctx->task)) {
     ctx->failed = 1;
     ctx->error = ECANCELED;
+    finish_upload_context_error(ctx);
     return -1;
   }
   while(size) {
@@ -415,6 +461,7 @@ filemgr_upload_data(void *upload_ctx, const char *data, size_t size) {
     data += take;
     size -= take;
     if(ctx->buffered == UPLOAD_BUFFER_SIZE && upload_flush(ctx)) {
+      finish_upload_context_error(ctx);
       return -1;
     }
   }
@@ -430,46 +477,55 @@ filemgr_upload_finish(struct MHD_Connection *conn, void *upload_ctx) {
     return send_json_error(conn, MHD_HTTP_BAD_REQUEST, "invalid path");
   }
   if(ctx->failed) {
-    if(ctx->task && !ctx->task_done) {
-      finish_upload_task(ctx->task,
-                         ctx->error == ECANCELED ? TASK_CANCELED : TASK_FAILED,
-                         ctx->target[0] ? ctx->target : ctx->task->current,
-                         ctx->error == ECANCELED ? "canceled" : strerror(ctx->error ? ctx->error : EIO));
-      ctx->task_done = 1;
-    }
+    finish_upload_context_error(ctx);
     errno = ctx->error ? ctx->error : EIO;
-    return send_json_error(conn, errno == EEXIST ? MHD_HTTP_CONFLICT :
-                           errno == EBUSY ? MHD_HTTP_CONFLICT :
-                           errno == ECANCELED ? MHD_HTTP_CONFLICT :
-                           errno == ENOSPC ? MHD_HTTP_INSUFFICIENT_STORAGE :
-                           MHD_HTTP_INTERNAL_SERVER_ERROR, NULL);
+    return send_json_error_detail(conn,
+                                  errno == EEXIST ? MHD_HTTP_CONFLICT :
+                                  errno == EBUSY ? MHD_HTTP_CONFLICT :
+                                  errno == ECANCELED ? MHD_HTTP_CONFLICT :
+                                  errno == ENOSPC ? MHD_HTTP_INSUFFICIENT_STORAGE :
+                                  MHD_HTTP_INTERNAL_SERVER_ERROR,
+                                  ctx->error == ECANCELED ? "canceled" : ctx->error_message,
+                                  ctx->error == ECANCELED ? NULL : "upload_failed",
+                                  ctx->target[0] ? ctx->target : NULL);
   }
+  ctx->stage = "writing file";
   if(ctx->buffered && upload_flush(ctx)) {
     ctx->error = ctx->error ? ctx->error : EIO;
     goto done;
   }
+  ctx->stage = "verifying uploaded size";
   if(ctx->expected && ctx->written != ctx->expected) {
     ctx->error = EIO;
     goto done;
   }
+  ctx->stage = "setting file permissions";
   if(fchmod_0777(ctx->fd)) {
     ctx->error = errno;
     goto done;
   }
+  ctx->stage = "syncing file data";
   if(fsync(ctx->fd)) {
     ctx->error = errno;
     goto done;
   }
+  ctx->stage = "closing temporary file";
   if(close(ctx->fd)) {
     ctx->fd = -1;
     ctx->error = errno;
     goto done;
   }
   ctx->fd = -1;
+  ctx->stage = "moving temporary file into place";
   if(rename(ctx->temp, ctx->target)) {
     ctx->error = errno;
     goto done;
   }
+  if(ctx->task) {
+    pthread_mutex_lock(&g_tasks_lock);
+    ctx->task->upload_completed++;
+    pthread_mutex_unlock(&g_tasks_lock);
+  }
   ret = 0;
 
 done:
@@ -478,19 +534,18 @@ done:
     ctx->fd = -1;
   }
   if(ret) {
+    upload_error_message(ctx);
     if(ctx->temp[0]) {
       unlink(ctx->temp);
     }
-    if(ctx->task && !ctx->task_done) {
-      finish_upload_task(ctx->task,
-                         ctx->error == ECANCELED ? TASK_CANCELED : TASK_FAILED,
-                         ctx->target[0] ? ctx->target : ctx->task->current,
-                         ctx->error == ECANCELED ? "canceled" : strerror(ctx->error ? ctx->error : EIO));
-      ctx->task_done = 1;
-    }
+    finish_upload_context_error(ctx);
     errno = ctx->error ? ctx->error : EIO;
-    return send_json_error(conn, errno == ECANCELED ? MHD_HTTP_CONFLICT :
-                           MHD_HTTP_INTERNAL_SERVER_ERROR, NULL);
+    return send_json_error_detail(conn,
+                                  errno == ECANCELED ? MHD_HTTP_CONFLICT :
+                                  MHD_HTTP_INTERNAL_SERVER_ERROR,
+                                  ctx->error == ECANCELED ? "canceled" : ctx->error_message,
+                                  ctx->error == ECANCELED ? NULL : "upload_failed",
+                                  ctx->target[0] ? ctx->target : NULL);
   }
   return send_json_ok(conn);
 }
@@ -516,5 +571,12 @@ filemgr_upload_free(void *upload_ctx) {
     }
   }
   free(ctx->buffer);
+  if(ctx->task) {
+    pthread_mutex_lock(&g_tasks_lock);
+    if(ctx->task->active_streams) {
+      ctx->task->active_streams--;
+    }
+    pthread_mutex_unlock(&g_tasks_lock);
+  }
   free(ctx);
 }