docs: added optional step for local file service (#4126)

docs/content/development/file-service/create-file-service.md

@@ -402,6 +402,30 @@ npx @medusajs/medusa-cli develop
 
 Then, try uploading a file, for example, using the [Upload File endpoint](/api/admin#tag/Uploads/operation/PostUploads). The file should be uploaded based on the logic you’ve implemented.
 
+### (Optional) Accessing the File
+
+:::note
+
+This step is only useful if you're implementing a local file service.
+
+:::
+
+Since the file is uploaded to a local directory `uploads`, you need to configure a static route in express that allows accessing the files within the `uploads` directory.
+
+To do that, create the file `src/api/index.ts` with the following content:
+
+```ts
+import express from "express"
+
+export default () => {
+  const app = express.Router()
+
+  app.use(`/uploads`, express.static(uploadDir))
+
+  return app
+}
+```
+
 ---
 
 ## See Also