: Their videos usually feature musical numbers, educational sketches, and "adventures" involving the puppet character Beto. Potential Contexts

: "Bely" is a common nickname or short form of names like Belinda or Belén; the file could be a private video shared between users. Technical Note on .mp4 Files

The .mp4 extension is a universal container format for digital video and audio. It is highly compatible across platforms like YouTube, Instagram, and mobile devices.

If the file is not related to the children's performers, it may be one of the following: