diff --git a/build-client.cjs b/build-client.cjs
index 04c0db5..e3c02b7 100644
--- a/build-client.cjs
+++ b/build-client.cjs
@@ -1499,23 +1499,126 @@ const extraComponentsCode = `
 			const onButtonClick = () => {
 				fileInputRef.current?.click();
 			};
-			const onFileChange = (e) => {
-				const files = e.target.files;
-				if (!files || files.length === 0) return;
+			const onFileChange = async (e) => {
+				const fileList = Array.from(e.target.files || []);
+				if (fileList.length === 0) return;
+				e.target.value = "";
+
 				const textarea = document.querySelector("textarea");
-				if (textarea) {
-					const dt = new DataTransfer();
-					for (let i = 0; i < files.length; i++) {
-						dt.items.add(files[i]);
+				const isZh = isZhLocale();
+
+				const imageFiles = [];
+				const textCodeFiles = [];
+				const binaryUploadFiles = [];
+
+				const CODE_EXT_MAP = {
+					js: "javascript", jsx: "javascript", mjs: "javascript", cjs: "javascript",
+					ts: "typescript", tsx: "typescript",
+					py: "python",
+					json: "json",
+					md: "markdown", markdown: "markdown",
+					html: "html", htm: "html",
+					css: "css", scss: "scss", less: "less",
+					sh: "bash", bash: "bash", zsh: "bash",
+					yaml: "yaml", yml: "yaml",
+					xml: "xml", svg: "xml",
+					sql: "sql",
+					c: "c", h: "c", cpp: "cpp", hpp: "cpp", cc: "cpp",
+					rs: "rust",
+					go: "go",
+					java: "java",
+					kt: "kotlin",
+					rb: "ruby",
+					php: "php",
+					lua: "lua",
+					toml: "toml", ini: "ini", conf: "ini", env: "ini",
+					txt: "text", log: "text", csv: "csv"
+				};
+
+				for (const file of fileList) {
+					const ext = (file.name.split(".").pop() || "").toLowerCase();
+					const isImage = file.type.startsWith("image/") || ["png", "jpg", "jpeg", "webp", "gif", "bmp"].includes(ext);
+
+					if (isImage) {
+						imageFiles.push(file);
+					} else if ((CODE_EXT_MAP[ext] || file.type.startsWith("text/")) && file.size <= 300 * 1024) {
+						textCodeFiles.push({ file, ext: CODE_EXT_MAP[ext] || "text" });
+					} else {
+						binaryUploadFiles.push(file);
 					}
-					const dropEvt = new DragEvent("drop", {
-						bubbles: true,
-						cancelable: true,
-						dataTransfer: dt
-					});
+				}
+
+				// 1. Process Images via native drop event to textarea
+				if (imageFiles.length > 0 && textarea) {
+					const dt = new DataTransfer();
+					for (const f of imageFiles) dt.items.add(f);
+					const dropEvt = new DragEvent("drop", { bubbles: true, cancelable: true, dataTransfer: dt });
 					textarea.dispatchEvent(dropEvt);
 				}
-				e.target.value = "";
+
+				// Helper to safely insert text into textarea and trigger React/DSH state updates
+				const insertIntoTextarea = (textToInsert) => {
+					if (!textarea) return;
+					const start = textarea.selectionStart ?? textarea.value.length;
+					const end = textarea.selectionEnd ?? textarea.value.length;
+					const val = textarea.value;
+					const prefix = (start > 0 && !val.endsWith("\\n") && !val.slice(0, start).endsWith("\\n")) ? "\\n" : "";
+					const nextValue = val.slice(0, start) + prefix + textToInsert + val.slice(end);
+
+					const setter = Object.getOwnPropertyDescriptor(window.HTMLTextAreaElement.prototype, "value")?.set;
+					if (setter) {
+						setter.call(textarea, nextValue);
+					} else {
+						textarea.value = nextValue;
+					}
+					textarea.dispatchEvent(new Event("input", { bubbles: true }));
+					textarea.dispatchEvent(new Event("change", { bubbles: true }));
+					textarea.focus();
+					const newPos = start + prefix.length + textToInsert.length;
+					textarea.setSelectionRange(newPos, newPos);
+				};
+
+				const formatSize = (bytes) => {
+					if (bytes < 1024) return bytes + " B";
+					if (bytes < 1024 * 1024) return (bytes / 1024).toFixed(1) + " KB";
+					return (bytes / (1024 * 1024)).toFixed(1) + " MB";
+				};
+
+				// 2. Process Text/Code files by reading and formatting as code blocks
+				for (const item of textCodeFiles) {
+					try {
+						const content = await item.file.text();
+						const tag = isZh ? "附加文件" : "Attached File";
+						const block = "[" + tag + ": " + item.file.name + "]\\n\`\`\`" + item.ext + "\\n" + content + "\\n\`\`\`\\n\\n";
+						insertIntoTextarea(block);
+					} catch (err) {
+						console.error("Failed to read text file:", err);
+					}
+				}
+
+				// 3. Process Binary/Large files by uploading to workspace
+				for (const file of binaryUploadFiles) {
+					try {
+						const res = await fetch("/api/model-enhancer/upload?filename=" + encodeURIComponent(file.name), {
+							method: "POST",
+							headers: { "X-Filename": encodeURIComponent(file.name) },
+							body: file
+						});
+						if (res.ok) {
+							const data = await res.json();
+							const tag = isZh ? "已上传文件至工作区" : "Uploaded file to workspace";
+							const ref = "[" + tag + ": ./" + data.path + " (" + formatSize(file.size) + ")]\\n";
+							insertIntoTextarea(ref);
+						} else {
+							const tag = isZh ? "文件上传失败" : "File upload failed";
+							insertIntoTextarea("[" + tag + ": " + file.name + "]\\n");
+						}
+					} catch (err) {
+						console.error("Failed to upload binary file:", err);
+						const tag = isZh ? "文件上传出错" : "File upload error";
+						insertIntoTextarea("[" + tag + ": " + file.name + " - " + (err.message || err) + "]\\n");
+					}
+				}
 			};
 
 			const onPlusClick = (e) => {
@@ -1533,7 +1636,6 @@ const extraComponentsCode = `
 						ref: fileInputRef,
 						type: "file",
 						multiple: true,
-						accept: "image/*,.png,.jpg,.jpeg,.webp,.gif",
 						style: { display: "none" },
 						onChange: onFileChange
 					}),
diff --git a/lib/client.js b/lib/client.js
index 91f1b7f..fc48967 100644
--- a/lib/client.js
+++ b/lib/client.js
@@ -3897,23 +3897,126 @@ window.__ModuleLoader__.load({
 			const onButtonClick = () => {
 				fileInputRef.current?.click();
 			};
-			const onFileChange = (e) => {
-				const files = e.target.files;
-				if (!files || files.length === 0) return;
+			const onFileChange = async (e) => {
+				const fileList = Array.from(e.target.files || []);
+				if (fileList.length === 0) return;
+				e.target.value = "";
+
 				const textarea = document.querySelector("textarea");
-				if (textarea) {
-					const dt = new DataTransfer();
-					for (let i = 0; i < files.length; i++) {
-						dt.items.add(files[i]);
+				const isZh = isZhLocale();
+
+				const imageFiles = [];
+				const textCodeFiles = [];
+				const binaryUploadFiles = [];
+
+				const CODE_EXT_MAP = {
+					js: "javascript", jsx: "javascript", mjs: "javascript", cjs: "javascript",
+					ts: "typescript", tsx: "typescript",
+					py: "python",
+					json: "json",
+					md: "markdown", markdown: "markdown",
+					html: "html", htm: "html",
+					css: "css", scss: "scss", less: "less",
+					sh: "bash", bash: "bash", zsh: "bash",
+					yaml: "yaml", yml: "yaml",
+					xml: "xml", svg: "xml",
+					sql: "sql",
+					c: "c", h: "c", cpp: "cpp", hpp: "cpp", cc: "cpp",
+					rs: "rust",
+					go: "go",
+					java: "java",
+					kt: "kotlin",
+					rb: "ruby",
+					php: "php",
+					lua: "lua",
+					toml: "toml", ini: "ini", conf: "ini", env: "ini",
+					txt: "text", log: "text", csv: "csv"
+				};
+
+				for (const file of fileList) {
+					const ext = (file.name.split(".").pop() || "").toLowerCase();
+					const isImage = file.type.startsWith("image/") || ["png", "jpg", "jpeg", "webp", "gif", "bmp"].includes(ext);
+
+					if (isImage) {
+						imageFiles.push(file);
+					} else if ((CODE_EXT_MAP[ext] || file.type.startsWith("text/")) && file.size <= 300 * 1024) {
+						textCodeFiles.push({ file, ext: CODE_EXT_MAP[ext] || "text" });
+					} else {
+						binaryUploadFiles.push(file);
 					}
-					const dropEvt = new DragEvent("drop", {
-						bubbles: true,
-						cancelable: true,
-						dataTransfer: dt
-					});
+				}
+
+				// 1. Process Images via native drop event to textarea
+				if (imageFiles.length > 0 && textarea) {
+					const dt = new DataTransfer();
+					for (const f of imageFiles) dt.items.add(f);
+					const dropEvt = new DragEvent("drop", { bubbles: true, cancelable: true, dataTransfer: dt });
 					textarea.dispatchEvent(dropEvt);
 				}
-				e.target.value = "";
+
+				// Helper to safely insert text into textarea and trigger React/DSH state updates
+				const insertIntoTextarea = (textToInsert) => {
+					if (!textarea) return;
+					const start = textarea.selectionStart ?? textarea.value.length;
+					const end = textarea.selectionEnd ?? textarea.value.length;
+					const val = textarea.value;
+					const prefix = (start > 0 && !val.endsWith("\n") && !val.slice(0, start).endsWith("\n")) ? "\n" : "";
+					const nextValue = val.slice(0, start) + prefix + textToInsert + val.slice(end);
+
+					const setter = Object.getOwnPropertyDescriptor(window.HTMLTextAreaElement.prototype, "value")?.set;
+					if (setter) {
+						setter.call(textarea, nextValue);
+					} else {
+						textarea.value = nextValue;
+					}
+					textarea.dispatchEvent(new Event("input", { bubbles: true }));
+					textarea.dispatchEvent(new Event("change", { bubbles: true }));
+					textarea.focus();
+					const newPos = start + prefix.length + textToInsert.length;
+					textarea.setSelectionRange(newPos, newPos);
+				};
+
+				const formatSize = (bytes) => {
+					if (bytes < 1024) return bytes + " B";
+					if (bytes < 1024 * 1024) return (bytes / 1024).toFixed(1) + " KB";
+					return (bytes / (1024 * 1024)).toFixed(1) + " MB";
+				};
+
+				// 2. Process Text/Code files by reading and formatting as code blocks
+				for (const item of textCodeFiles) {
+					try {
+						const content = await item.file.text();
+						const tag = isZh ? "附加文件" : "Attached File";
+						const block = "[" + tag + ": " + item.file.name + "]\n```" + item.ext + "\n" + content + "\n```\n\n";
+						insertIntoTextarea(block);
+					} catch (err) {
+						console.error("Failed to read text file:", err);
+					}
+				}
+
+				// 3. Process Binary/Large files by uploading to workspace
+				for (const file of binaryUploadFiles) {
+					try {
+						const res = await fetch("/api/model-enhancer/upload?filename=" + encodeURIComponent(file.name), {
+							method: "POST",
+							headers: { "X-Filename": encodeURIComponent(file.name) },
+							body: file
+						});
+						if (res.ok) {
+							const data = await res.json();
+							const tag = isZh ? "已上传文件至工作区" : "Uploaded file to workspace";
+							const ref = "[" + tag + ": ./" + data.path + " (" + formatSize(file.size) + ")]\n";
+							insertIntoTextarea(ref);
+						} else {
+							const tag = isZh ? "文件上传失败" : "File upload failed";
+							insertIntoTextarea("[" + tag + ": " + file.name + "]\n");
+						}
+					} catch (err) {
+						console.error("Failed to upload binary file:", err);
+						const tag = isZh ? "文件上传出错" : "File upload error";
+						insertIntoTextarea("[" + tag + ": " + file.name + " - " + (err.message || err) + "]\n");
+					}
+				}
 			};
 
 			const onPlusClick = (e) => {
@@ -3931,7 +4034,6 @@ window.__ModuleLoader__.load({
 						ref: fileInputRef,
 						type: "file",
 						multiple: true,
-						accept: "image/*,.png,.jpg,.jpeg,.webp,.gif",
 						style: { display: "none" },
 						onChange: onFileChange
 					}),
diff --git a/lib/index.js b/lib/index.js
index d789ac2..19e268e 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -1,3 +1,6 @@
+import fs from 'node:fs';
+import path from 'node:path';
+
 export const name = 'dsh-plugin-model-enhancer';
 export const inject = ['webServer'];
 
@@ -33,12 +36,12 @@ async function getModelsDevData() {
 }
 
 export function apply(ctx) {
+  // 1. Models.dev Cache Proxy
   ctx.effect(() => {
     return ctx.webServer.register({
       kind: 'exact',
       path: '/api/models-dev/models',
       handler: async (req, res) => {
-        // Add CORS headers so web client can always reach it seamlessly
         res.setHeader('Access-Control-Allow-Origin', '*');
         res.setHeader('Access-Control-Allow-Methods', 'GET, OPTIONS');
         res.setHeader('Access-Control-Allow-Headers', 'Content-Type');
@@ -70,4 +73,69 @@ export function apply(ctx) {
       }
     });
   }, 'dsh-plugin-model-enhancer: webServer proxy route');
+
+  // 2. Binary / Large Document File Upload to Workspace Endpoint
+  ctx.effect(() => {
+    return ctx.webServer.register({
+      kind: 'exact',
+      path: '/api/model-enhancer/upload',
+      handler: async (req, res) => {
+        res.setHeader('Access-Control-Allow-Origin', '*');
+        res.setHeader('Access-Control-Allow-Methods', 'POST, OPTIONS');
+        res.setHeader('Access-Control-Allow-Headers', 'Content-Type, X-Filename');
+
+        if (req.method === 'OPTIONS') {
+          res.writeHead(204);
+          res.end();
+          return;
+        }
+
+        if (req.method !== 'POST') {
+          res.writeHead(405, { 'Content-Type': 'application/json' });
+          res.end(JSON.stringify({ error: 'Method Not Allowed' }));
+          return;
+        }
+
+        try {
+          const urlObj = new URL(req.url, 'http://127.0.0.1');
+          const rawName = req.headers['x-filename'] || urlObj.searchParams.get('filename') || `upload_${Date.now()}.bin`;
+          const decodedName = decodeURIComponent(rawName);
+          const safeName = path.basename(decodedName);
+
+          const uploadDir = path.join(process.cwd(), 'uploads');
+          fs.mkdirSync(uploadDir, { recursive: true });
+
+          const targetPath = path.join(uploadDir, safeName);
+          const writeStream = fs.createWriteStream(targetPath);
+
+          let totalBytes = 0;
+          req.on('data', (chunk) => {
+            totalBytes += chunk.length;
+          });
+
+          req.pipe(writeStream);
+
+          writeStream.on('finish', () => {
+            res.writeHead(200, { 'Content-Type': 'application/json' });
+            res.end(JSON.stringify({
+              ok: true,
+              filename: safeName,
+              path: path.join('uploads', safeName),
+              size: totalBytes
+            }));
+          });
+
+          writeStream.on('error', (err) => {
+            ctx.logger?.error?.('[model-enhancer] Upload stream error:', err);
+            res.writeHead(500, { 'Content-Type': 'application/json' });
+            res.end(JSON.stringify({ error: err.message || 'File write error' }));
+          });
+        } catch (err) {
+          ctx.logger?.error?.('[model-enhancer] Upload handler error:', err);
+          res.writeHead(500, { 'Content-Type': 'application/json' });
+          res.end(JSON.stringify({ error: err.message || 'Upload processing error' }));
+        }
+      }
+    });
+  }, 'dsh-plugin-model-enhancer: workspace file upload endpoint');
 }