I am looking for a solution to collaborative PDF editing (mostly annotations). I already have a Nextcloud installation with Office for several members so it would be great if it could be integrated, but it is not necessary.
What I mainly want is the possibility to add and view annotations made by several users on the same file at the same time.
Do you have a suggestion?


I think OnlyOffice supports that. There is an extension for that for Nextcloud.
I have installed OnlyOffice Community Edition and it seems to work. I need to test it with a few others over a real connection (not just locally), but it seems promising.
I tried that. It opens PDFs in Impress (their PowerPoint) and provides only a very basic annotation interface.I was wrong. I was using Nextcloud Office not OnlyOffice.
OnlyOffice doesn’t have “Impress”. I think you are confusing that with LibreOffice or Collabora Office.
You might be right.
I think you may be thinking of LibreOffice