Question about Musrun MP3 Player

Not in my opinion, no. The surface is fixed and cannot be replaced or added to.

haven't tried it... no idea if it works

It is not possible to edit or download apps. The apps shown on the display are fixed and cannot be changed.
In addition, the resolution of the display in the text area is very pixelated.

Hello, I have tried it, but unfortunately it did not work for me.

I can't say, I haven't tried it yet

Unfortunately I can't tell you, I haven't tried this yet