diff --git a/desktop-client/src-tauri/Cargo.lock b/desktop-client/src-tauri/Cargo.lock
index d67d112..539effd 100644
--- a/desktop-client/src-tauri/Cargo.lock
+++ b/desktop-client/src-tauri/Cargo.lock
@@ -3116,12 +3116,14 @@ dependencies = [
  "sync_wrapper",
  "tokio",
  "tokio-rustls",
+ "tokio-util",
  "tower",
  "tower-http",
  "tower-service",
  "url",
  "wasm-bindgen",
  "wasm-bindgen-futures",
+ "wasm-streams 0.4.2",
  "web-sys",
  "webpki-roots",
 ]
@@ -3156,7 +3158,7 @@ dependencies = [
  "url",
  "wasm-bindgen",
  "wasm-bindgen-futures",
- "wasm-streams",
+ "wasm-streams 0.5.0",
  "web-sys",
 ]
 
@@ -4716,6 +4718,19 @@ dependencies = [
  "wasmparser",
 ]
 
+[[package]]
+name = "wasm-streams"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "15053d8d85c7eccdbefef60f06769760a563c7f0a9d6902a13d35c7800b0ad65"
+dependencies = [
+ "futures-util",
+ "js-sys",
+ "wasm-bindgen",
+ "wasm-bindgen-futures",
+ "web-sys",
+]
+
 [[package]]
 name = "wasm-streams"
 version = "0.5.0"
diff --git a/desktop-client/src-tauri/Cargo.toml b/desktop-client/src-tauri/Cargo.toml
index 15ee5bc..08e3c94 100644
--- a/desktop-client/src-tauri/Cargo.toml
+++ b/desktop-client/src-tauri/Cargo.toml
@@ -22,5 +22,5 @@ tauri = { version = "2", features = [] }
 tauri-plugin-opener = "2"
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
-reqwest = { version = "0.12", default-features = false, features = ["json", "cookies", "multipart", "rustls-tls"] }
+reqwest = { version = "0.12", default-features = false, features = ["json", "cookies", "multipart", "stream", "rustls-tls"] }
 urlencoding = "2.1"
diff --git a/desktop-client/src-tauri/src/lib.rs b/desktop-client/src-tauri/src/lib.rs
index 73c15f5..4df5698 100644
--- a/desktop-client/src-tauri/src/lib.rs
+++ b/desktop-client/src-tauri/src/lib.rs
@@ -620,8 +620,6 @@ async fn api_upload_file(
         .and_then(|name| name.to_str())
         .map(|name| name.to_string())
         .ok_or_else(|| "无法识别文件名".to_string())?;
-
-    let file_bytes = fs::read(&source_path).map_err(|err| format!("读取文件失败: {}", err))?;
     let normalized_target = if target_path.trim().is_empty() {
         "/".to_string()
     } else {
@@ -634,9 +632,15 @@ async fn api_upload_file(
         return Err("API 地址不能为空".to_string());
     }
 
+    // 使用流式 multipart 上传，避免大文件整块读入内存导致占用暴涨。
+    let file_part = reqwest::multipart::Part::file(&source_path)
+        .await
+        .map_err(|err| format!("读取文件失败: {}", err))?
+        .file_name(file_name);
+
     let multipart = reqwest::multipart::Form::new()
         .text("path", normalized_target)
-        .part("file", reqwest::multipart::Part::bytes(file_bytes).file_name(file_name));
+        .part("file", file_part);
 
     let mut request = state
         .client
diff --git a/desktop-client/src/App.vue b/desktop-client/src/App.vue
index e27bd34..2f6ba7b 100644
--- a/desktop-client/src/App.vue
+++ b/desktop-client/src/App.vue
@@ -70,7 +70,7 @@ const selectedFileName = ref("");
 const searchKeyword = ref("");
 const shares = ref<ShareItem[]>([]);
 
-const transferTasks = ref<{ id: string; name: string; speed: string; progress: number; status: string }[]>([]);
+const transferTasks = ref<{ id: string; name: string; speed: string; progress: number; status: string; note?: string }[]>([]);
 const sharesLoading = ref(false);
 const contextMenu = reactive({
   visible: false,
@@ -280,17 +280,25 @@ function showToast(message: string, type = "info") {
   }, 2500);
 }
 
-function prependTransferTask(task: { id: string; name: string; speed: string; progress: number; status: string }) {
+function prependTransferTask(task: { id: string; name: string; speed: string; progress: number; status: string; note?: string }) {
   transferTasks.value = [task, ...transferTasks.value.slice(0, 49)];
 }
 
 function updateTransferTask(
   id: string,
-  patch: Partial<{ name: string; speed: string; progress: number; status: string }>,
+  patch: Partial<{ name: string; speed: string; progress: number; status: string; note?: string }>,
 ) {
   transferTasks.value = transferTasks.value.map((task) => (task.id === id ? { ...task, ...patch } : task));
 }
 
+function getTaskStatusLabel(status: string) {
+  if (status === "uploading") return "上传中";
+  if (status === "downloading") return "下载中";
+  if (status === "done") return "已完成";
+  if (status === "failed") return "失败";
+  return status;
+}
+
 async function invokeBridge(command: string, payload: Record<string, any>) {
   try {
     return await invoke<BridgeResponse>(command, payload);
@@ -624,14 +632,15 @@ async function downloadSelected(target?: FileItem | null) {
   });
 
   if (nativeResponse.ok && nativeResponse.data?.success) {
-    updateTransferTask(taskId, { speed: "-", progress: 100, status: "done" });
+    updateTransferTask(taskId, { speed: "-", progress: 100, status: "done", note: "下载成功" });
     const savedPath = nativeResponse.data?.savePath ? `\n${nativeResponse.data.savePath}` : "";
     showToast(`下载完成${savedPath}`, "success");
     return;
   }
 
-  updateTransferTask(taskId, { speed: "-", progress: 0, status: "failed" });
-  showToast(nativeResponse.data?.message || "原生下载失败", "error");
+  const message = String(nativeResponse.data?.message || "原生下载失败");
+  updateTransferTask(taskId, { speed: "-", progress: 0, status: "failed", note: message });
+  showToast(message, "error");
 }
 
 function selectFile(item: FileItem) {
@@ -764,13 +773,16 @@ async function uploadDroppedFiles(paths: string[]) {
         speed: "-",
         progress: 100,
         status: "done",
+        note: "上传成功",
       });
     } else {
       dropState.failed += 1;
+      const message = String(response.data?.message || "上传失败");
       updateTransferTask(taskId, {
         speed: "-",
         progress: 0,
         status: "failed",
+        note: message,
       });
     }
   }
@@ -802,7 +814,12 @@ async function registerDragDropListener() {
 
       if (payload.type === "drop") {
         dropState.active = false;
-        if (!canUseDragUpload()) return;
+        if (!canUseDragUpload()) {
+          if (authenticated.value) {
+            showToast("请先切换到“全部文件”页面再上传", "info");
+          }
+          return;
+        }
         void uploadDroppedFiles(payload.paths || []);
       }
     });
@@ -995,7 +1012,8 @@ onBeforeUnmount(() => {
                 <div v-for="task in transferTasks" :key="task.id" class="task-row">
                   <div>
                     <strong>{{ task.name }}</strong>
-                    <small>{{ task.id }} · {{ task.status }}</small>
+                    <small>{{ task.id }} · {{ getTaskStatusLabel(task.status) }}</small>
+                    <small v-if="task.note" class="task-note" :class="{ error: task.status === 'failed' }">{{ task.note }}</small>
                   </div>
                   <div class="task-right">
                     <span>{{ task.speed }}</span>
@@ -1639,9 +1657,19 @@ select:focus {
 }
 
 .task-row small {
+  display: block;
   color: #647b94;
 }
 
+.task-note {
+  margin-top: 2px;
+  color: #5f7895;
+}
+
+.task-note.error {
+  color: #c24747;
+}
+
 .task-right {
   display: grid;
   gap: 6px;