Hi there everyone. I just upgraded my storage because I want to be able to add PDF files and have them available to a group. But after the upgrade I still can't attach PDF files.
Make sure your group allows for file editing (group settings here on the website) and that either you're an owner/admin or the group allows file editing by members.
Groups that are Public and Open can't have files attached. You can change the group type to "Public Closed" or Private and enable file editing to share files with the group.
Upgrade Storage
https://www.zotero.org/groups/ > Manage Library