Can't open up otf file in Glyphs 3

I’m getting an error when attempting to open up a .otf file in the new Glyphs

Could you send me that file?

I was actually able to figure it out through converting it to a .ttf. Thanks for the follow up!

How did you convert it? It might not be a good idea to convert the curves to TrueType because that can reduce the quality of the shapes. It would help a lot if you could send that .otf file (by email to “support” at this domain, or a (dropbox) link vai a direct message in the forum.