In order to use this plugin, you need to explicitly enable it per project. I.e. `for a project > Settings (tab) > Project (tab, the first one) > Modules (field set/box) > Check "Redmine More Previews"`
I felt into this trap. Initially I though the code was not working. Browsing a bit through the issues: I saw this often.
E.g. https://github.com/HugoHasenbein/redmine_more_previews#use
w/ something like:
I felt into this trap. Initially I though the code was not working. Browsing a bit through the issues: I saw this often.