Can't access Steam Library in other parts of my $HOME

While I was able to add the ones inside my $HOME, I can’t seem to add the ones in my other drives. I was able to add the ones inside my $HOME, but not anywhere else.

I have another drive, mounted inside /home/DATA, like my 870 EVO 4TB is on /home/DATA/870E4TB.

Any idea why I can’t add stuff in there now? I can still save stuff there with Firefox.

I tried to manually add by writing to the ~/snap/steam/common/.local/share/Steam/config/libraryfolders.vdf, but no dice.