diff --git a/backend/services/admin-service/src/application/services/file-storage.service.ts b/backend/services/admin-service/src/application/services/file-storage.service.ts
index 62a0806..b9c40f5 100644
--- a/backend/services/admin-service/src/application/services/file-storage.service.ts
+++ b/backend/services/admin-service/src/application/services/file-storage.service.ts
@@ -3,11 +3,13 @@ import * as crypto from 'crypto';
 import { Client as MinioClient } from 'minio';
 
 const BUCKET = 'app-releases';
+const PRESIGN_EXPIRY = 3600; // 1 hour
 
 @Injectable()
 export class FileStorageService {
   private readonly logger = new Logger(FileStorageService.name);
   private readonly minio: MinioClient;
+  private readonly ossBase: string;
 
   constructor() {
     this.minio = new MinioClient({
@@ -17,43 +19,25 @@ export class FileStorageService {
       accessKey: process.env.MINIO_ACCESS_KEY || 'genex-admin',
       secretKey: process.env.MINIO_SECRET_KEY || 'genex-minio-secret',
     });
+    this.ossBase = process.env.OSS_BASE_URL || 'https://oss.gogenex.com';
   }
 
-  /** Upload file to MinIO and return metadata */
-  async uploadFile(
-    buffer: Buffer,
-    originalName: string,
-    platform: string,
-    versionName: string,
-  ) {
-    // Ensure bucket exists
-    const exists = await this.minio.bucketExists(BUCKET);
-    if (!exists) {
-      await this.minio.makeBucket(BUCKET);
-    }
-
-    // Compute SHA256
-    const sha256 = crypto.createHash('sha256').update(buffer).digest('hex');
-
-    // Generate object name
+  /** Generate object name for a new upload */
+  generateObjectName(originalName: string, platform: string, versionName: string): string {
     const ext = originalName.split('.').pop() || 'bin';
     const timestamp = Date.now();
     const random = crypto.randomBytes(4).toString('hex');
-    const objectName = `${platform}/${versionName}/${timestamp}-${random}.${ext}`;
+    return `${platform}/${versionName}/${timestamp}-${random}.${ext}`;
+  }
 
-    // Upload
-    await this.minio.putObject(BUCKET, objectName, buffer, buffer.length, {
-      'Content-Type':
-        ext === 'apk'
-          ? 'application/vnd.android.package-archive'
-          : 'application/octet-stream',
-    });
+  /** Generate a presigned PUT URL so the browser can upload directly to MinIO */
+  async presignedPutUrl(objectName: string): Promise<string> {
+    return this.minio.presignedPutObject(BUCKET, objectName, PRESIGN_EXPIRY);
+  }
 
-    return {
-      objectName,
-      fileSize: buffer.length.toString(),
-      sha256,
-    };
+  /** Public download URL for an object */
+  downloadUrl(objectName: string): string {
+    return `${this.ossBase}/app-releases/${objectName}`;
   }
 
   /** Stream file from MinIO to a writable (e.g. Express Response) */
diff --git a/backend/services/admin-service/src/interface/http/controllers/admin-version.controller.ts b/backend/services/admin-service/src/interface/http/controllers/admin-version.controller.ts
index 3696f70..6e777fe 100644
--- a/backend/services/admin-service/src/interface/http/controllers/admin-version.controller.ts
+++ b/backend/services/admin-service/src/interface/http/controllers/admin-version.controller.ts
@@ -1,8 +1,7 @@
 import {
   Controller, Get, Post, Put, Patch, Delete, Inject,
-  Param, Query, Body, UseGuards, UseInterceptors, UploadedFile, Req,
+  Param, Query, Body, UseGuards, Req,
 } from '@nestjs/common';
-import { FileInterceptor } from '@nestjs/platform-express';
 import { ApiTags, ApiOperation, ApiBearerAuth, ApiConsumes, ApiQuery } from '@nestjs/swagger';
 import { JwtAuthGuard, Roles, RolesGuard, UserRole } from '@genex/common';
 import { AppVersionService } from '../../../application/services/app-version.service';
@@ -82,12 +81,24 @@ export class AdminVersionController {
     return { code: 0, data: version };
   }
 
+  @Get('presigned-url')
+  @ApiOperation({ summary: 'Get presigned PUT URL for direct browser-to-MinIO upload' })
+  async getPresignedUrl(
+    @Query('filename') filename: string,
+    @Query('platform') platform: string,
+    @Query('versionName') versionName: string,
+  ) {
+    const objectName = this.fileStorage.generateObjectName(filename, platform.toUpperCase(), versionName);
+    const uploadUrl = await this.fileStorage.presignedPutUrl(objectName);
+    return {
+      code: 0,
+      data: { uploadUrl, objectName, downloadUrl: this.fileStorage.downloadUrl(objectName) },
+    };
+  }
+
   @Post('upload')
-  @UseInterceptors(FileInterceptor('file', { limits: { fileSize: 500 * 1024 * 1024 } }))
-  @ApiConsumes('multipart/form-data')
-  @ApiOperation({ summary: 'Upload APK/IPA and create version' })
+  @ApiOperation({ summary: 'Save version metadata after direct MinIO upload' })
   async uploadVersion(
-    @UploadedFile() file: Express.Multer.File,
     @Body() body: {
       appType?: string;
       platform: string;
@@ -98,57 +109,36 @@ export class AdminVersionController {
       isForceUpdate?: string;
       minOsVersion?: string;
       releaseDate?: string;
+      objectName: string;
+      fileSize: string;
+      fileSha256?: string;
     },
     @Req() req: any,
   ) {
-    if (!file) {
-      return { code: 400, message: 'No file uploaded — check Content-Type boundary' };
-    }
-    // Parse package to extract metadata (auto-fill when not provided)
-    const parsedInfo = await this.packageParser.parse(file.buffer, file.originalname);
-
     const appType: AppType = (body.appType || 'GENEX_MOBILE').toUpperCase() as AppType;
-    const platform: Platform = body.platform
-      ? (body.platform.toUpperCase() as Platform)
-      : (parsedInfo.platform as Platform);
-    const versionCode = body.versionCode
-      ? parseInt(body.versionCode, 10)
-      : parsedInfo.versionCode || 1;
-    const versionName = body.versionName || parsedInfo.versionName || '1.0.0';
+    const platform: Platform = body.platform.toUpperCase() as Platform;
+    const versionCode = body.versionCode ? parseInt(body.versionCode, 10) : 1;
+    const versionName = body.versionName || '1.0.0';
     const buildNumber = body.buildNumber || versionCode.toString();
 
-    // Upload to MinIO
-    const uploadResult = await this.fileStorage.uploadFile(
-      file.buffer,
-      file.originalname,
-      platform,
-      versionName,
-    );
-
     const version = await this.versionService.createVersion({
       appType,
       platform,
       versionCode,
       versionName,
       buildNumber,
-      storageKey: uploadResult.objectName,
-      downloadUrl: '', // will be updated after id is known
-      fileSize: uploadResult.fileSize,
-      fileSha256: uploadResult.sha256,
+      storageKey: body.objectName,
+      downloadUrl: this.fileStorage.downloadUrl(body.objectName),
+      fileSize: body.fileSize,
+      fileSha256: body.fileSha256 || '',
       changelog: body.changelog || '',
       isForceUpdate: body.isForceUpdate === 'true',
-      minOsVersion: body.minOsVersion || parsedInfo.minSdkVersion,
+      minOsVersion: body.minOsVersion,
       releaseDate: body.releaseDate ? new Date(body.releaseDate) : undefined,
       createdBy: req.user?.sub,
     });
 
-    // Direct download URL via MinIO (oss.gogenex.com/app-releases/<storageKey>)
-    const ossBase = process.env.OSS_BASE_URL || 'https://oss.gogenex.com';
-    const updated = await this.versionService.updateVersion(version.id, {
-      downloadUrl: `${ossBase}/app-releases/${uploadResult.objectName}`,
-    });
-
-    return { code: 0, data: updated };
+    return { code: 0, data: version };
   }
 
   @Post('parse')
diff --git a/frontend/admin-web/src/infrastructure/repositories/version.repository.ts b/frontend/admin-web/src/infrastructure/repositories/version.repository.ts
index 964d021..f6a0877 100644
--- a/frontend/admin-web/src/infrastructure/repositories/version.repository.ts
+++ b/frontend/admin-web/src/infrastructure/repositories/version.repository.ts
@@ -21,16 +21,39 @@ class VersionRepository implements IVersionRepository {
   }
 
   async upload(input: UploadVersionInput): Promise<AppVersion> {
-    const fd = new FormData();
-    fd.append('file', input.file);
-    fd.append('appType', input.appType);
-    fd.append('platform', input.platform);
-    if (input.versionName) fd.append('versionName', input.versionName);
-    if (input.buildNumber) fd.append('buildNumber', input.buildNumber);
-    if (input.changelog) fd.append('changelog', input.changelog);
-    if (input.minOsVersion) fd.append('minOsVersion', input.minOsVersion);
-    fd.append('isForceUpdate', String(input.isForceUpdate));
-    return httpClient.post<AppVersion>('/api/v1/admin/versions/upload', fd, { timeout: 300000 });
+    // Step 1: get presigned PUT URL from admin-service
+    const { uploadUrl, objectName, downloadUrl } = await httpClient.get<{
+      uploadUrl: string;
+      objectName: string;
+      downloadUrl: string;
+    }>('/api/v1/admin/versions/presigned-url', {
+      params: {
+        filename: input.file.name,
+        platform: input.platform,
+        versionName: input.versionName || '1.0.0',
+      },
+    });
+
+    // Step 2: PUT file directly to MinIO (browser → MinIO, no admin-service relay)
+    const putRes = await fetch(uploadUrl, {
+      method: 'PUT',
+      body: input.file,
+      headers: { 'Content-Type': input.file.type || 'application/octet-stream' },
+    });
+    if (!putRes.ok) throw new Error(`MinIO upload failed: ${putRes.status}`);
+
+    // Step 3: save metadata to admin-service
+    return httpClient.post<AppVersion>('/api/v1/admin/versions/upload', {
+      appType: input.appType,
+      platform: input.platform,
+      versionName: input.versionName,
+      buildNumber: input.buildNumber,
+      changelog: input.changelog,
+      minOsVersion: input.minOsVersion,
+      isForceUpdate: String(input.isForceUpdate),
+      objectName,
+      fileSize: String(input.file.size),
+    });
   }
 
   async update(id: string, input: UpdateVersionInput): Promise<AppVersion> {