From the VideoPlayer help (click the ? at the appinventor), it says: "You can also set the media source to a URL that points to a streaming video, but the URL must point to the video file itself, not to a program that plays the video. At the "blocks" I set "VideoPlayer1.Source" to http://XX.com/tu…

Thank you for your hints. Finally, I decided to download the .mp4 file from the internet as a previus step, as explained here . Once I have it stored in the mobile storage as a temporary file, I set the file path in VideoPlayer and can play it without any problem.

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