uploaded “attachment”
https://s3.amazonaws.com/zotero.org/images/forums/u12250205/4x5mgt33m5v1byt3nuz8.png
Recently, I have tried uploading documents into Zotero using my iPad and iPhone and the documents are automatically becoming an attachment. I am unable to change the type of document on my iPad, iPhone, or MacBook. On my MacBook, I am only able to change the document through assigning a DOI or book number.
The iOS app doesn't yet support retrieving metadata for PDFs, but that's coming soon — it's currently available in the beta version.
Generally, though, as in the desktop app, you want to save to the app from the article page in your browser, and the app will save metadata and automatically attach a PDF if one is available.