There's no way to pay for the app since it is no longer on Apple Store...you can still continue to use it for free if you already purchased it. (see guides earlier in this thread to reinstall on newer devices).
Marvin still works on my iPhone 15, iOS 17.6.1.
I haven't used an internal link to dropbox/files app/one drive in a long time so I'm not sure about those. It does, however, work just fine with OPDS, which is what I use to serve my ePubs from my Calibre library.
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