I have an installation of Stirling PDF, but in my short experiment it had no ability to collaborate on the same document.
Every edit created a new copy of the document downloaded to the user. The annotations weren’t tagged to the individual user and sending different versions of a PDF from user to user is not what I am looking for.
Stirling is a single user software in that regards. I haven’t tested the also mentioned BentoPDF but I suspect it to be the same as it is also trying to be a PDF toolbox like Acrobat. PdfDing has a slightly different approach it might be an option if OnlyOffice does not work out.










I am thankful for any input. Maybe it helps someone else looking for a similar thing.
I think the collaborative part means sending PDFs from user to user and maintaining the ability to edit annotations. That may work for many use cases - a lot of businesses may be fine with that when email is still the communication medium of choice.