I downloaded a free font that included four
.ttf files for the Regular, Italic, Bold, and Bold Italic variants, all different. I dragged them into Font Book and they all appeared in a group, but the three variants other than Regular were flagged as duplicates:
Multiple copies of this font are installed.
If I choose
Resolve automatically all variants except Regular are shown as
Off. If I right-click and enable these variants, ignoring the multiple-copies message, I'm still not able to use all the variants in TextEdit or Photoshop (the only apps I've checked in so far).
What's going on with this font? The previews in Font Book look exactly as I expect them to (rendering as the proper variants).