Allow apps to use your Documents folder
Some apps and websites can use your Documents folder to provide you with services and features. For example, an app might use your Documents folder to access specific files in the folder. See Control access to your files and folders.
To authorize an app or a website to use information from your Documents folder, click OK in the dialog. If you don’t want to authorize the use of your Documents folder, click Don’t Allow.
If you allow third-party apps or websites to use your Documents folder, any information they collect is governed by their terms and privacy policies. It’s recommended that you learn about the privacy practices of those parties.
You can review and change your privacy settings using the Privacy pane of Security & Privacy preferences.
Choose Apple menu 
> System Preferences, click Security & Privacy, then click Privacy.