back in past in 3.x we get the ability to add "type of media support" by uploading thing there : Look & Feel tab -> Post Content -> Manage Media Tag

in my case  i use short flv video and i notice they aren't supported in 4.1 and like i migrated from 3.x and have using the module from @Marcher Technologies i think we perhaps need one in 4.x but but  were to add him like this "manage media tag" not existing and were i can see what is supported or not ?

 

 

Doesn't exist. But there is a plugin to it, i use it and it world flawless.