[maxmalkav]

Are the notes and highlights stored in the PDF? Asking because I use Zotero in several machines and I need annotations and highlights to be synchronized without much hassle.

Zotero is quite close to provide a PDF reader itself (available in the Beta release, AFAIK), but nice to see alternatives with academic documents in mind.

[hexomancer]

No, however, we have a command which exports a version of PDF file with embedded notes and highlights.

[maxmalkav]

Thanks a lot for explaining this. Having such feature is definitely useful.