After an upgrade to version 10.0.8 from 9.1.3 it seems all well except for the comments tab in file details side bar which is not present.
In previous versions I used the comments app which is not supported anymore.
Any suggestion is welcome.
Maybe you don’t have enabled the comments app providing this functionality?
Ok, I solved the problem.
During the upgrade I had to delete a previous version of comments app not supported anymore.
To make it appear again I had to copy the folder comments from the new version of owncloud.