That sounds like a you problem lol...mp4 is by far the more universally used video format
These days .mov is just annoying, especially when the codec used is H264. One of the reasons GWM doesn’t support it is that it isn’t supported by browsers (except maybe Safari?), so the site would need to do work to repackage and possibly transcode. For a site developed by one guy in his spare time, it’s a big effort for little return.
Just get Handbrake to do the conversion.
Just a note, as tamarok alluded to, most .mov files already have their video stream in the H264 codec, meaning the stream just needs to be repackaged into a .mp4 container, which can be done losslessly without re-encoding the actual video data.
Handbrake probably has that option, I personally use Avidemux (which works fine with mp4s) set to "copy" mode, or FFmpeg Batch, with -c copy in the Parameters box.
Idk I think it’s annoying having to convert to mp4 every time I crop or edit a video on my phone.