[ta988]

Yes a Zotero app for mobile is something unfortunately missing. Ot doesnt seem too hard to talk to their API though.

[newfromblammo]

There has been a Zotero mobile app in the worka for awhile. The API is brilliant, if you’re an iOS user you can use Shortcuts to build with it.

[petemir]

Papership exists for iOS. It's not perfect, but it is good enough. I principally use it to search through the tree structure of documents, and then open them with other apps.

[ta988]

I discovered today "Zoo for Zotero", an android app that is Free. Seems to work well.