Hello Dinesh,
I tried following this video but it is from 3 years ago and it appears some things have changed. I have the Creator upgrade on my WordPress site, have purchased your API key to be able to upload the three fonts that are part of my branding kit, and they are all visible in the “Upload” section and I have assigned them correctly. My only active plugins are Gutenberg, Layout Grid, and Use Any Font (and two that WordPress requires me to keep on). I am using the “Assembler” theme so it’s not a matter of incompatibility with the theme. However, my fonts still do not show up under “styles” in the drop down menus. The “Additional CSS” is different now from what was featured in this video and I have no idea how to code CSS. Please help!