Adding users to Development App Folder

App folders are account-specific, and are only accessible to the user of that account. If another user were to connect the app to their own account, they would get their own distinct app folder. App folders of different users of the same app do not sync with each other. If you want to have other users connect their accounts to your app to get their own app folders, you should implement the OAuth app authorization flow.

Also, note that app folders are incompatible with shared folders, meaning you can't share an app folder, put a shared folder inside an app folder or put an app folder in a shared folder. If you need to use the API with shared folders, you'll need to use "full Dropbox" permission, as opposed to the app folder permission. You can find more information about app permissions here.