Currently, when an MP4/Video file is dragged from the Assets Panel, into the Navigator, or onto the Stage, it creates a MediaElement featuring the URI of the video file.

However, when the same operation is performed on an MP3/Audio file, the action is not permitted, and the user must first introduce a MediaElement Element, then fill out its 'Source' Property with the path of the audio file.

See attached video.

Repro Steps:

1) Download x1 MP3 Audio file of your choice from: https://pixabay.com/music/search/sample/ (or any other source of your choice)
2) Download x1 MP4 Video file of your choice from: https://pixabay.com/videos/ (or any other source of your choice)

3) Create a Studio Project featuring a MainPage.xaml, and place the two assets from Steps 1) and 2) into the Project directory, as to make them visible in Studio's 'Assets' Panel.

4) Click-and-Drag the MP4 video file from the Assets Panel into the Page's root Grid.
Observe how a MediaElement featuring the video file is populated.

5) Click-and-Drag the MP3 audio file from the Assets Panel into the Page's root Grid.
Observe how the same operation can't be performed.

Expected Results: Click-and-dragging an MP3 Audio file automatically creates a MediaElement with its associated path in the Element's 'Source' Property, just as happens with video files.