Thanks for the screenshot, super helpful Paulus One. Those red warning icons look like the upload is failing for each .ttf file. Quick couple questions so we can narrow it down and pass it to the team:

1) What browser + OS are you on (and does it happen in an incognito window too)?

2) What happens when you click the red warning icon, any error text?

3) Roughly how big are the font files, and do other fonts (like a different .ttf/.otf) upload successfully or is it only this HarmonyOS Sans SC set?