Video works well on windows but lags when uploaded or moved anywhere

so i made and exported a video from shotcut, i opened it and it works well with no problem

but then i tried uploading it to youtube, and half of the video is lagging or just straight up frozen with no movement at all

so i tried maybe moving the video to my phone then uploading it, and it doesn’t even open on my phone

i even tried saving the video in google drive, and its also all laggy

so what do i do now?

What resolution and framerate it is? Did you change any of the default export settings?

Try to export a short 1 minute section with default x264 without hardware acceleration and see if that works.