Enter a token for each of your mobile devices in a separate field. You can get a new field by clicking on the [+]. Enter one token each then on your mobile devices to enable uploads on them.
If you have any problems, reset the problematic token here and on the mobile device where it does not work.
Note: Tokens must be at least 6 characters long. They are changed automatically after each upload here and on the mobile device through which you uploaded content.