Why can I not export my font as a .ttf?

When I go to file > export, the dialogue box does not give me the option to select which type of file I would like to save my font as (no .ttf/.otf/other option available). Rather, just my glyphs mini file is saved to my computer. Previously, I was able to export and download a .tff file of an older version of the font flawlessly. Now that I have made some modifications, it does not allow me the option to export just the font. Any advice?

What version of Glyphs do you have? Can you show a screenshot of what you are getting?

Glyphs Mini.

Glyphs mini doesn’t support exporting TrueType fonts. Only OpenType.