Fonts added in new "collection" don't appear in the folder

Hello again Jeremy, thank you for the quick reply :folded_hands:
I’m still a bit confused - what do you mean by “collection folder”?
For your message I suspect the issue you’re having might be related to the one mentioned in this topic Dragging font files into collection doesn't work - #6 by Viklon
Does the description in this other forum topic seem to match your case?

Thank you again,