[Pajamaman]

Yes, I've done that. No change. Currently when on long click in

1. the Library, it shows just neoreader
2. the storage folder view, neoreader and alreader.

So the open with options are inconsistent between storage and library.

I previously had this problem with Koreader in Library view (Koreader disappeared after I uninstalled and reinstalled it.)

Edit:

I just installed Alreader on another Onyx Nova and Alreader shows in Storage and Library Open with options.

The Open with behavior seems unpredictable and inconsistent in general. Which is inconvenient as the Onyx Library is the default and dominant interface, and appears not to work well when wanting to switch between reading apps. I may ultimately install a different file explorer, or a even a different launcher. But if you are invested in the main Library view and use more than one app, uninstall and reinstall at your peril.