On my iPhone SE2, I have ios 14.2 (Beta) although problems started since 14.1. I can't download books from Dropbox any more, keep getting error. And the scroll bar on the bottom doesn't work very well. When I try to scroll books to the middle of a chapter, it keeps going back to the front. Takes a few swipes before it will scroll but I cant scroll slowly to look for a certain page.
I'm still on ios13 on my main phone just coz I find the Marvin on the ios14 buggy. I'd rather have a working Marvin than new features on ios14
Really wish Marvin would get updated. I'd buy it again in a heartbeat! Have tried others but I keep returning to Marvin just coz it's easier to use, very organized and has more settings.