iMovie 10.1.11 won't import audio
I have an iMac (early 2011) with OS10.13.6 / 12Gig Ram.
I using iMovie 10.1.1.
When I try to import .mp4 files, I get video with no audio.
When I play the .mp4 files with Quicktime Player, they play with video AND audio.
What gives? What am I doing wrong? Never had this problem before.
iMac 21.5", macOS 10.13