Collaborators Editing Attachments

Can Collaborators Edit Documents?  For example, I have sent a document to a team who have limited requirements to use Wrike and are therefore set up as Colllaborators.  When a member of the team right clicks on the document they cannot edit the document.

Anyone with feedback on this?  We can work around by downloading and editing the document then re-upload the document.  But for me this doesnt make sense.