iPad iOS 11 Screen Recording Audio disappears in other apps

I have created screen recordings on iPad Pro iOS 11.1 with audio. The video saves to Photos and plays with audio. I can export the video directly to YouTube from Photos with audio. I can airdrop the recording to my iMac and play it with audio or edit in iMovie with audio.

BUT, if I import the screen recording video with audio into the Apple Clips app or the iMovie app on my iPad, there's no audio, just like it has been deleted (no audio waves visible in iMovie).

Why am I losing audio in my screen recording videos when I'm trying to edit it in other apps? Is there a work around or fix for this?