The original Youtube video you can choose the resolution and download it wherever you want, a request appears for the save path.
CDXL and MPEG1 videos are downloaded to HD in a Movies directory created from program in the AmiTube folder.
AmiTube also allows you to execute CDXL and MPEG1 files in Off-Line mode saved on HD.
I'm creating a tutorial video for the news about AROS One x86
EDIT:
You can find the Video Tutorial and other info on my Thread "AROS One 68k Work In Progress".
Translated the Catalog in Italian, now AmiTube is also in Italian, I attach screenshot of AmiTube on Amiga OS3.9 AfA One