How to merge time lapsed videos on iPhone?

I have 4-5 videos of me dying my hair gradually over a few days in time lapse videos and wanted to merge them altogether but so far every app I've tried has failed to recognise the files, only regular videos work and not time lapses videos. Any idea on which apps will work or what I can do?

If the video clips were all done using your iPhone, then iMovie should be able to recognise them

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