In order to convert (export) .imoviemobile files to MP4 format, you need to use the Share Movie to Camera Roll option in iMovie app. If you do not have access to the program, you have to decompress the .imoviemobile file (it's a renamed ZIP) and convert the source data with some online converter or conversion app, which will eventual achieve for imoviemobile to mp4 conversion.
Updated: July 20, 2020
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