QB Plugin File Manager not working on Mobile

I would be willing to bet it doesn't work on mobile, and is probably planned to only work on the new forms, once they are released on mobile.

Quickbase has been very public in saying they will put zero work into their current mobile platform, as they are focusing all their efforts on rolling out the new forms on mobile. I have been a very vocal critic of their strategy, as they have been saying this since I started developing 4 years ago. In 4 years they have not even fixed a single mobile bug, or done a single shred of work on the current mobile platform. If this frustrates you as much as me, please speak up to your rep and lets get QB to listen to its customers!