I find a bug!
When user upload a file which have same name as exist file. This extension will simply upload the picture as new version.
For example, When I upload file: rin.jpg there is another exist rin.jpg in my wiki. Then this extension simple upload the rin.jpg as a new version of old rin.jpg.
I hope, when duplicate happened, this extension can ask user change their file name.
That's it! This is a great extension! Hope you can fix this tiny bug soon!