diff --git a/frontend/index.html b/frontend/index.html
index fd7a66a..dda039f 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -1180,7 +1180,7 @@
     </div>
 
     <!-- Scripts -->
-    <script src="/static/js/main.js?v=4.0"></script>
+    <script src="/static/js/main.js?v=5.0"></script>
     <script src="/static/js/trial-periods.js?v=1.3"></script>
     <script src="/static/js/trial-periods-page.js?v=1.6"></script>
 </body>
diff --git a/frontend/js/main.js b/frontend/js/main.js
index 388fae5..463ac2e 100644
--- a/frontend/js/main.js
+++ b/frontend/js/main.js
@@ -61,7 +61,7 @@ function canDelete() {
 }
 
 document.addEventListener("DOMContentLoaded", function () {
-  console.log("CRM System Main JS v4.5 Loaded - " + new Date().toLocaleString());
+  console.log("CRM System Main JS v5.0 Loaded - " + new Date().toLocaleString());
   // 登录守卫
   const token = localStorage.getItem("crmToken");
   if (!token && !window.location.pathname.endsWith("login.html")) {
@@ -3233,54 +3233,78 @@ document.addEventListener("DOMContentLoaded", function () {
       const files = Array.from(this.files);
       if (files.length === 0) return;
 
-      const formData = new FormData();
-      files.forEach(file => {
-        if (file.type.startsWith("image/")) {
-          formData.append("screenshots", file);
-        } else {
-          console.warn(`File is not an image: ${file.name}`);
-        }
-      });
+      const newBase64Images = [];
 
-      if (formData.getAll("screenshots").length === 0) {
-        alert("请选择有效的图片文件");
-        return;
+      // Helper to convert file to base64 with retry
+      const fileToBase64 = async (f, attempt = 1) => {
+        try {
+          return await new Promise((resolve, reject) => {
+            const reader = new FileReader();
+            reader.onload = () => resolve(reader.result);
+            reader.onerror = () => reject(reader.error || new Error("FileReader error"));
+            reader.onabort = () => reject(new Error("File read aborted"));
+            reader.readAsDataURL(f);
+          });
+        } catch (err) {
+          // If NotReadableError, retry up to 3 times
+          if (attempt < 3 && (err.name === "NotReadableError" || err.code === 1)) {
+            console.warn(`Retrying ${f.name} read due to error (attempt ${attempt})...`);
+            await new Promise(r => setTimeout(r, 200 * attempt));
+            return fileToBase64(f, attempt + 1);
+          }
+          throw err;
+        }
+      };
+
+      for (const file of files) {
+        if (!file.type.startsWith("image/")) {
+          console.warn(`File is not an image: ${file.name}`);
+          continue;
+        }
+
+        try {
+          console.log(`[v5.0] Converting ${file.name} (${file.size} bytes)...`);
+          const base64 = await fileToBase64(file);
+          newBase64Images.push(base64);
+          console.log(`Successfully converted ${file.name}`);
+        } catch (error) {
+          console.error(`Primary method failed for ${file.name}:`, error);
+
+          // Fallback: arrayBuffer (usually works when FileReader fails)
+          try {
+            console.log(`Trying arrayBuffer fallback for ${file.name}...`);
+            const buffer = await file.arrayBuffer();
+            const bytes = new Uint8Array(buffer);
+            let binary = "";
+            const chunkSize = 8192;
+            for (let i = 0; i < bytes.length; i += chunkSize) {
+              const chunk = bytes.slice(i, i + chunkSize);
+              binary += String.fromCharCode.apply(null, chunk);
+            }
+            const b64 = `data:${file.type};base64,${btoa(binary)}`;
+            newBase64Images.push(b64);
+            console.log(`Fallback successful for ${file.name}`);
+          } catch (fallbackError) {
+            console.error(`Both methods failed for ${file.name}:`, fallbackError);
+            alert(`无法读取文件 "${file.name}"。\n这种情况通常是浏览器或系统文件锁定导致的。\n\n建议尝试：\n1. 刷新页面后再试\n2. 使用浏览器的“无痕模式”\n3. 确认文件没有被其他软件打开`);
+          }
+        }
       }
 
-      try {
-        console.log(`[v4.0] Uploading ${files.length} files to server...`);
-        const response = await authenticatedFetch("/api/upload", {
-          method: "POST",
-          body: formData,
-          // Note: When sending FormData, the browser automatically sets the correct Content-Type with boundary
-        });
-
-        if (response.ok) {
-          const result = await response.json();
-          const newBase64Images = result.filePaths || [];
-          console.log(`Successfully uploaded ${newBase64Images.length} images`);
-
-          if (type === "create") {
-            createUploadedScreenshots = [
-              ...createUploadedScreenshots,
-              ...newBase64Images,
-            ];
-            renderScreenshotPreviews("create", createUploadedScreenshots);
-          } else {
-            editUploadedScreenshots = [
-              ...editUploadedScreenshots,
-              ...newBase64Images,
-            ];
-            renderScreenshotPreviews("edit", editUploadedScreenshots);
-          }
+      if (newBase64Images.length > 0) {
+        if (type === "create") {
+          createUploadedScreenshots = [
+            ...createUploadedScreenshots,
+            ...newBase64Images,
+          ];
+          renderScreenshotPreviews("create", createUploadedScreenshots);
         } else {
-          const errorText = await response.text();
-          console.error("Upload failed:", errorText);
-          alert("图片上传失败，请稍后重试。");
+          editUploadedScreenshots = [
+            ...editUploadedScreenshots,
+            ...newBase64Images,
+          ];
+          renderScreenshotPreviews("edit", editUploadedScreenshots);
         }
-      } catch (error) {
-        console.error("Error during upload:", error);
-        alert("上传过程出错，可能是浏览器权限问题或网络连接中断。");
       }
 
       // 清除 input，以便再次选择同一张图片