Thanks!
Yes, I know. This method requires the user to select files from the Windows Explorer or from the mobile to be downloaded, very efficiently, but I want to synchronize some of the user's folders with folders in the server through server code as a selectable feature. I have not achieved this with the built-in function but use it for downloading images from the Mobile, which works satisfactorily.
This means that both downloading and uploading are required. If it becomes too demanding to achieve this in the server, I have to make an app that is loaded for the users that can perform download and upload, which is entirely possible. But means more hassle for users!