Final cut pro x - My screen recorded mp4 video by iphone is silent when played in FCPX after imported

Thank you sir, just remember that you have mentioned this practice in the book FINAL CUT PRO X BEYOND THE BASICS, 2nd.

And I have again found several another ways to tackle the above issue:

1. Convert the video in the Finder to ProRes with Encode Selected Video Files, which should be enabled first.
2. Change the iphone video extension from .MP4 to .mov directly, then try to import it into FCPX and check the sound
3. Convert with Quicktime Player: open the video with Quicktime Player, then choose File ->Export As ->4K..., and import the newly exported 4k video into FCPX and check the sound
4. Convert in the compressor

Thank you for writing the excellent book FINAL CUT PRO X BEYOND THE BASICS, 2nd.