diff --git a/ui/static/index.html b/ui/static/index.html
index 505199e..c729853 100644
--- a/ui/static/index.html
+++ b/ui/static/index.html
@@ -194,39 +194,7 @@ body {
     background: var(--surface-darken);
 }
 
-.file-info {
-    display: none;
-    align-items: center;
-    gap: 6px;
-    font-size: 12px;
-    color: var(--text-muted);
-    background: var(--surface-darken);
-    padding: 3px 8px;
-    border-radius: 4px;
-}
 
-.file-info.attached {
-    display: inline-flex;
-}
-
-.file-info-name {
-    color: var(--success);
-    max-width: 200px;
-    overflow: hidden;
-    text-overflow: ellipsis;
-    white-space: nowrap;
-}
-
-.file-info-remove {
-    cursor: pointer;
-    color: var(--accent);
-    font-weight: bold;
-    padding: 0 4px;
-}
-
-.file-info-remove:hover {
-    color: var(--warning);
-}
 
 .btn {
     padding: 6px 16px;
@@ -635,10 +603,7 @@ body {
             <div class="file-upload-row">
                 <input type="file" class="file-input" id="fileInput">
                 <button class="file-upload-btn" id="fileUploadBtn">📎 添加文件</button>
-                <span class="file-info" id="fileInfo">
-                    <span class="file-info-name" id="fileInfoName"></span>
-                    <span class="file-info-remove" id="fileInfoRemove">✕</span>
-                </span>
+
             </div>
             <div class="input-buttons">
                 <button class="btn" id="sendBtn">发送</button>
@@ -758,10 +723,6 @@ const closeHelpBtn = document.getElementById('closeHelp');
 // File upload
 const fileInputEl = document.getElementById('fileInput');
 const fileUploadBtn = document.getElementById('fileUploadBtn');
-const fileInfoEl = document.getElementById('fileInfo');
-const fileInfoNameEl = document.getElementById('fileInfoName');
-const fileInfoRemoveEl = document.getElementById('fileInfoRemove');
-let attachedFile = null;
 
 // Config inputs
 const apiKeyEl = document.getElementById('apiKey');
@@ -1036,8 +997,8 @@ function readFileAsText(file) {
 
 // Send Message
 async function sendMessage() {
-    let message = messageInputEl.value.trim();
-    if (!message && !attachedFile) return;
+    const message = messageInputEl.value.trim();
+    if (!message) return;
 
     // Check if API is configured
     if (apiStatusEl.textContent === '未配置') {
@@ -1045,19 +1006,6 @@ async function sendMessage() {
         return;
     }
 
-    // If file is attached, read it and prepend to message
-    if (attachedFile) {
-        try {
-            const fileContent = await readFileAsText(attachedFile);
-            const fileBlock = `文件名：${attachedFile.name}\n内容：\n\`\`\`\n${fileContent}\n\`\`\``;
-            message = message ? `${fileBlock}\n\n${message}` : fileBlock;
-        } catch (e) {
-            updateLatestMessage(`❌ 文件读取失败: ${e.message}`);
-            return;
-        }
-        clearFile();
-    }
-
     // Add user message to UI
     addMessageToUI('user', message);
     messageInputEl.value = '';
@@ -1177,27 +1125,30 @@ function closeSidebar() {
 }
 
 // File upload helpers
-function attachFile(file) {
-    attachedFile = file;
-    fileInfoNameEl.textContent = file.name;
-    fileInfoEl.classList.add('attached');
-    fileUploadBtn.textContent = '📎 更换文件';
-}
-
-function clearFile() {
-    attachedFile = null;
-    fileInputEl.value = '';
-    fileInfoEl.classList.remove('attached');
-    fileUploadBtn.textContent = '📎 添加文件';
+function insertFileContent(file) {
+    readFileAsText(file).then(content => {
+        const block = `文件名：${file.name}\n内容：\n${content}`;
+        const current = messageInputEl.value;
+        const cursorPos = messageInputEl.selectionStart;
+        if (current.length === 0) {
+            messageInputEl.value = block;
+        } else {
+            // 插入到光标位置
+            messageInputEl.value = current.slice(0, cursorPos) + block + '\n\n' + current.slice(cursorPos);
+        }
+        messageInputEl.focus();
+        fileInputEl.value = '';
+    }).catch(e => {
+        alert(`文件读取失败: ${e.message}`);
+    });
 }
 
 fileUploadBtn.addEventListener('click', () => fileInputEl.click());
 fileInputEl.addEventListener('change', () => {
     if (fileInputEl.files && fileInputEl.files[0]) {
-        attachFile(fileInputEl.files[0]);
+        insertFileContent(fileInputEl.files[0]);
     }
 });
-fileInfoRemoveEl.addEventListener('click', clearFile);
 
 // Event Listeners
 sendBtn.addEventListener('click', sendMessage);