Let me start off by saying I love YACReader, have been using it for years. The Library/Reader solution you came up with for syncing and managing libraries is great and I’ve made good use of it so far. However, I feel it has some limitations in certain use cases that can be dealt with through better files app
Specifically, as I move more and more towards doing most of my computing on an iPad, YACR remains one of the apps that are still reliant on a PC/Mac to sync. Getting files onto the iPad without using YACReader Library is a bit more difficult than I would hope (I don’t want to upload my collection to OneDrive/Dropbox, so I haven’t tried that method year which I’m sure would be a little bit easier).
I know you already have some files integration already through the “more...” option on the import tab. This document picker is very limited however, mostly due to it only being possible to select/import one item at a time.
The change I’m requesting/suggesting is the setup the Infuse iOS app uses - there is an “Infuse” folder in the “on my iPad/iPhone” section of the Files app, and this shows the full folder structure of infuse and the videos it holds. A user can then add/remove any folder or video from within the files app, dragging and dropping from different services (including USB and SMB servers with the new iPadOS update!). I would imagine you could even deprecate your custom OneDrive/Google Drive/etc. support from within the app if you would like, as that functionality is already taken care of in Files.
Thanks for reading, but more so thanks for developing this app for all these years.