I got Collabra Online working correctly now and so far, I can only give a very positive feedback
What I am missing are the following 2 options:
Rename: If I create a new document, it´s somehow called “new document”, but I cannot see any possibility here to rename it. The question is: Where should this be done? Is it an issue of the addon?
Delete: There is no possibility to delete new or upladed documents. Does somebody know if this will be coming (or did I just oversee the option)?