How to Add Custom Fonts to Gamma for Better PPTX Export and Templates

As I know some others are reading this and following along: Gamma doesnt have standard fonts like Arial / Calibri / etc... that export nicely to PPTX. BUT you can install fonts if you download the ttf file for a font (you can google any font and ttf and you'll find github repos with basically every font and the ttf file and then upload the ttf to gamma (under custom themes). Then create a theme with the font you want and then create a template from the theme.