diff --git a/src/server/utils/files.test.ts b/src/server/utils/files.test.ts
new file mode 100644
index 000000000000..2c3dacc5a5c9
--- /dev/null
+++ b/src/server/utils/files.test.ts
@@ -0,0 +1,36 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+
+import { fileEnv } from '@/config/file';
+
+import { getFullFileUrl } from './files';
+
+const config = {
+  S3_ENABLE_PATH_STYLE: false,
+  S3_PUBLIC_DOMAIN: 'https://example.com',
+  S3_BUCKET: 'my-bucket',
+};
+
+vi.mock('@/config/file', () => ({
+  get fileEnv() {
+    return config;
+  },
+}));
+
+describe('getFullFileUrl', () => {
+  it('should return empty string for null or undefined input', () => {
+    expect(getFullFileUrl(null)).toBe('');
+    expect(getFullFileUrl(undefined)).toBe('');
+  });
+
+  it('should return correct URL when S3_ENABLE_PATH_STYLE is false', () => {
+    const url = 'path/to/file.jpg';
+    expect(getFullFileUrl(url)).toBe('https://example.com/path/to/file.jpg');
+  });
+
+  it('should return correct URL when S3_ENABLE_PATH_STYLE is true', () => {
+    config.S3_ENABLE_PATH_STYLE = true;
+    const url = 'path/to/file.jpg';
+    expect(getFullFileUrl(url)).toBe('https://example.com/my-bucket/path/to/file.jpg');
+    config.S3_ENABLE_PATH_STYLE = false;
+  });
+});
diff --git a/src/server/utils/files.ts b/src/server/utils/files.ts
index a421af64c86b..537fe2213efe 100644
--- a/src/server/utils/files.ts
+++ b/src/server/utils/files.ts
@@ -5,5 +5,9 @@ import { fileEnv } from '@/config/file';
 export const getFullFileUrl = (url?: string | null) => {
   if (!url) return '';
 
+  if (fileEnv.S3_ENABLE_PATH_STYLE) {
+    return urlJoin(fileEnv.S3_PUBLIC_DOMAIN!, fileEnv.S3_BUCKET!, url);
+  }
+
   return urlJoin(fileEnv.S3_PUBLIC_DOMAIN!, url);
 };