Right now, if you want to back up photos from a camera to your ProtonDrive account via a tablet, the most straightforward way is to import the images to the tablet, and then open the ProtonDrive app and upload them. I propose skipping the middle step and simply upload them from the camera directly to ProtonDrive.

1. If you have an inexpensive tablet, the number of photos to backup might easily exceed the space available on the tablet.
2. Such backups might be crucial for photojournalists using professional cameras in ares where security forces sometime confiscate cameras. The alternative is hiding the sd card the images are on and hoping it is not discovered in a search.