Upload custom font

Are you an Enterprise account? If so, that will be why you do not see the Upload font option. Your admin will need to upload custom fonts for you.
https://helpx.adobe.com/enterprise/using/custom-fonts.html

I'm having the same issue.  I am logged in going to Your Stuff / Brands and clicking on the Fonts section. I do not see an Upload button - just a list of fonts and More Fonts. Anyone have a solution for this?

Try from the Your Stuff>Brands and look for the Fonts section. Click add your fonts and in this pop-up menu choose Upload from the bottom left-hand side.