Re: mediaplayer
After much trial and error it seems that this is a browser problem.
Mediaplayer will not automatically display pdf files from the gallery in Firefox .
They show as a link which will open if you click on it.
54.0.1
Firefox Release
June 29, 2017
It works perfectly with Edge, Opera and Chrome and Internet Explorer.
I'm surprised that other people have not found this. Perhaps its a setting in my firefox options?
RR