What's the story with importing .MOV files? (Premier Pro CC 12.1 Kentos)

Just now I was trying to import a .MOV file that I recorded from my Nikon Z7, via my Atomos Ninja V.   The .MOV file, when played in Quicktime, has both audio and video.   But when I imported it into Premiere Pro Project panel and dropped it on the timeline it only had a VIDEO track but NO AUDIO.  The right-click Properties say "Project Audio Format: 48000 Hz - 32 bit floating point - Mono"

So I looked online and there were lots of complaints about Premiere Pro importing .MOV files, but they all said they got audio but no video!!

So then I thought, "silly me, I didn't first do a New Sequence From Clip".   So I did that and put it on the timeline and it had one video track and FOUR tracks of Audio!

BTW, online someone said you could fix PP's .MOV problems by changing the extension of the .MOV file to .MP4.  But when I do that I ONLY get the audio.

A Google search shows that Premiere Pro has had problems with .MOV files for years; why can't they fix this? What is going on here?  

Related Question:   .MOV is a wrapper format.  Different codecs can be used to populate what's inside.  In the case of .MOV files from the Atomos Ninja V, it could be (from their manual..) "Apple ProRes HQ,422, LT, AVID DNxHR, HQX. HQ, SQ, LB".   How do I tell what's in there?

Thanks in advance.