In my solution I have several media type classes that will match for jpg/png using MediaDescriptor.
Is there a way to tell EPiServer what is the default type? Looks like EPiServer simply picks the first type it finds.
My quick fix is to use naming of media type classes to "tell" EPiServer what is the default one. Would be great if there was a better solution for this - such as using an attribute of some kind.
A solution to the problem: