[ausbin]

> I'm familiar with Zotero and Calibre, though both are desktop only

There's a third-party Zotero client for Android named "Zoo for Zotero" that has worked well for me: https://play.google.com/store/apps/details?id=com.mickstarif.... However, I usually use it to read academic papers on my phone that I have already added to my library using my computer. I tried adding something new to my Zotero library on my phone as I was typing this comment, and sadly the interface seems a little clumsy: I can add papers to a collection but not a subcollection