diff --git a/app/(pages)/explorer/viewer/page.tsx b/app/(pages)/explorer/viewer/page.tsx
index a5b5364..10b5fd9 100644
--- a/app/(pages)/explorer/viewer/page.tsx
+++ b/app/(pages)/explorer/viewer/page.tsx
@@ -2,6 +2,7 @@
 "use client";
 
 import React, { useEffect } from "react";
+import dynamic from "next/dynamic";
 import { toast } from "react-toastify";
 
 import { parseStringPath, useExplorer } from "@/hooks/useExplorer";
@@ -15,7 +16,8 @@ import TextViewer from "@/components/viewers/text-viewer";
 import ImageViewer from "@/components/viewers/image-viewer";
 import VideoViewer from "@/components/viewers/video-viewer";
 import AudioViewer from "@/components/viewers/audio-viewer";
-import PDFViewer from "@/components/viewers/pdf-viewer";
+/** @see https://github.com/wojtekmaj/react-pdf/issues/1811#issuecomment-2151416080 */
+const PDFViewer = dynamic(() => import("@/components/viewers/pdf-viewer"), { ssr: false }) as typeof React.Component<ViewerProps>;
 
 export function getViewer(type: string): typeof React.Component<ViewerProps> | null {
     switch(type) {
diff --git a/app/api/fs/file/route.ts b/app/api/fs/file/route.ts
index 1f10095..47d20f7 100644
--- a/app/api/fs/file/route.ts
+++ b/app/api/fs/file/route.ts
@@ -53,3 +53,33 @@ export async function GET(req: NextRequest) {
         return error(500);
     }
 }
+
+export async function PATCH(req: NextRequest) {
+    const token = req.cookies.get(tokenStorageKey)?.value;
+
+    if(!token) return error(401);
+    if(!validateToken(token)) return error(403);
+
+    const { searchParams } = new URL(req.url);
+    const targetPath = searchParams.get("path") ?? "/";
+    const content = (await req.formData()).get("content");
+
+    if(!content) error(400);
+
+    try {
+        if(!targetPath || !fs.existsSync(targetPath)) return error(404);
+
+        const stat = fs.statSync(targetPath);
+    
+        if(!stat.isFile()) return error(400);
+
+        fs.writeFileSync(targetPath, content?.toString() ?? "");
+        
+        return packet({});
+    } catch (err) {
+        // eslint-disable-next-line no-console
+        console.log("[Server: /api/fs/file] "+ err);
+
+        return error(500);
+    }
+}
diff --git a/components/viewers/index.ts b/components/viewers/index.ts
index bfbed4f..3bb8463 100644
--- a/components/viewers/index.ts
+++ b/components/viewers/index.ts
@@ -60,8 +60,42 @@ export default abstract class Viewer<P extends ViewerProps, S = {}> extends Reac
         }
     }
 
-    /** @todo */
-    protected async saveFile() {}
+    protected async saveFile(data: string) {
+        try {
+            const { status } = await axios.patch(
+                `/api/fs/file?path=${this.props.path}`,
+                { content: data },
+                {
+                    headers: {
+                        "Content-Type": "multipart/form-data"
+                    }
+                }
+            );
+
+            if(status === 200) toast.success("保存成功");
+        } catch (_err) {
+            const err = _err as AxiosError;
+            const status = err.response?.status ?? 0;
+
+            switch(status) {
+                case 400:
+                    toast.error(`该路径或请求无效 (${status})`);
+                    break;
+                case 401:
+                    toast.error(`未登录 (${status})`);
+                    break;
+                case 403:
+                    toast.error(`无效的访问token (${status})`);
+                    break;
+                case 404:
+                    toast.error(`找不到该文件 (${status})`);
+                    break;
+                case 500:
+                    toast.error(`服务器内部错误 (${status})`);
+                    break;
+            }
+        }
+    }
 
     public componentDidMount() {
         document.title = this.name +" - "+ this.props.path;
diff --git a/components/viewers/text-viewer.tsx b/components/viewers/text-viewer.tsx
index 8d2a846..7ba88cc 100644
--- a/components/viewers/text-viewer.tsx
+++ b/components/viewers/text-viewer.tsx
@@ -31,7 +31,7 @@ export default class TextViewer extends Viewer<TextViewerProps, TextViewerState>
     }
 
     private async handleSave() {
-        await this.saveFile();
+        await this.saveFile(this.state.value);
         this.setState({ edited: false });
     }
 
diff --git a/components/viewers/video-viewer.tsx b/components/viewers/video-viewer.tsx
index ceee505..8483048 100644
--- a/components/viewers/video-viewer.tsx
+++ b/components/viewers/video-viewer.tsx
@@ -26,7 +26,6 @@ interface VideoViewerState {
 }
 
 export default class VideoViewer extends Viewer<VideoViewerProps, VideoViewerState> {
-    private readonly isFlv: boolean;
     private blob: Blob = new Blob();
     private videoRef = React.createRef<HTMLVideoElement>();
 
@@ -42,8 +41,6 @@ export default class VideoViewer extends Viewer<VideoViewerProps, VideoViewerSta
             duration: 0,
             currentTime: 0
         };
-
-        this.isFlv = this.props.fileName.split(".").findLast(() => true) === "flv";
     }
 
     private handlePlayButtonClick() {