i want to know if its possible to filter by extension which files in a directory are shown. in many file managers you can add for example *.jpg to the path. that did not work for me and the documentation is non existent.
This is not possible at the moment, although it is something that could be implemented in future. The only work-round is to sort by type, as indicated above.
The intention is the elementaryos apps are simple enough to be self-documenting so if there is no obvious way of doing something it is probably not implemented! Of course, at present, this ideal is not always reached ...