@ChuckPa Thanks for the tips! But that is not the problem. I FINALLY find the bug! It is really wired! You can reproduce it 100% on your own: name the folder as es14_1, put media files in it, then try with new scanner.
I think there is a bug in your new movie scanner regex matching. As long as a folder/drive naming in the scheme ^es\d\d[-_]\d+ in the path, then everything inside that folder/drive will not be scanned. It has to be this regex format to trigger the bug because I have tried many other and they all won’t trigger it.
It is too funny that all my large drives are named like this! Maybe Plex doesn’t like WD Easystore? That’s why I name them like this. LOL.
Okay, now, could we fix this or I have to rename my drive because Plex forbid this naming convention? 
