iMovie’ videos can not play on TV

Check your TV manual to see what file specs it supports for video and file system on the flash drive. What share did you use from iMovie? All file share quality settings give you an MP4 with H264 encoding except best which is pro res. Your TV will not support pro res but should be ok with MP4. Did you format the drive as exFat or FAT32?

Not sure how you are trying to use usb. The easiest way to view your iMovies on a TV is to save them to a usb flash drive and plug the drive into your TV. Format the flash drive as exFAT.