The video talks about common issues that people run into when using Beetle Saturn core on Apple devices and how to fix them.
One issue is that the ROMs available online are probably in .bin and .cue format, which can sometimes cause problems if the .cue file contains path names.
The .cue file is a playlist of track files, and the path names have to point to the correct file.
Some systems are case sensitive so the file referenced in the .cue file needs to have the same capitalization as the actual file name.
Another reason the game may not play is missing or incorrect BIOS files.
Resources:
CHDMAN
https://wiki.recalbox.com/en/tutorials/utilities/rom-conversion/chdman
BIOS Files
https://github.com/archtaurus/RetroPieBIOS/tree/master
Beetle Saturn Core Documentation
https://docs.libretro.com/library/beetle_saturn/
Retroarch App Store Link
https://apps.apple.com/us/app/retroarch/id6499539433