i tried adding a timer but my imovie decided not to open because of my macos is not 12.6 or later. and i had no option to edit because i recorded audio seperately and the file doesn't open without apple devices so i edited it from my tablet but it took a while (3 hours) and it didn't let me add a timer so i directly uploaded the video to youtube because my tablet don't have enough storage.

it was a challange

i calculated the time with youtube frame timer. i can send the full video and the link of timer if its needed