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I'm using MP4 file format

Thats weird. Mp4 formats work for me.

it uploads ok but when clicking the submit button after everything has been done, It seems to hang and take along time, Ive left it for 30 min to 1hr but nothing.

Found the problem I was using Edge but I switched to the latest version of Firefox and it works.

Ahhhh, ok. Thanks for the update! Maybe someone can find this info in the future! :)