To be able to see your fonts applied in Scene Designer texts you should follow this guide step by step.
First you should navigate to Media Library;
Then create a Folder named Fonts;
Open Fonts folder and create another folder with your font's name;
Upload your font files with pre-defined names, (you can also rename files after upload);
Font names must be regular, regular-italic, bold, bold-italic
Supported Font files by Media Library are; .ttf, .otf, .eot, .woff, .woff2, .svg
If you also have a preview image of the font you should name it preview(.png, .jpg etc.)
Now you will be able to apply your font in the Scene Designer;
At the end you must have the below folder-file structure;
Fonts
My Custom Font
regular.woff (required)
regular-italic.woff
bold.woff
bold-italic.woff
preview.png
Pricing Font
regular.ttf (required)
bold.ttf
preview.png
Greeting Font
regular.otf (required)