there is no sound after I upload my video file into iMovie

Hi, happizoo,

Try converting your troublesome clip to H.264, Mp4/AAC with the free

download, Handbrake. Do that even if the codec already is indicated to be

Mp4/AAC. Re-rendering often cures the issue.

You can get Handbrake here:

https://handbrake.fr/

A simple way to do it is to open Handbrake and do a File/Open Source.

Navigate to your video and choose it as the source from the resulting screen.

Then do File/Start Encoding. Wait a couple of minutes for the conversion to

complete. Then save and import the converted clip into iMovie. It should work

fine.

-- Rich