I didnt know they had an app @Barb is this the one you're using?
https://imgur.com/a/DBkSY4g [Mirror of the same image
https://ibb.co/YRt1L33 ]
Seems more to me like a bookstore and a Pocketbook Cloud Sync app
pretty nice, I don't use it tho. However, curious to know how much space is free in the cloud. . as well as does it sync bookmarks, notes, last page read on any device. (eg iOS to e-reader)
Edit: Official information about the app >
https://pocketbook.ch/en-ch/app