Blank Screen Fix
If you are in China - Vellum runs on a backend by Google, which is blocked in China. There are certain instances that will trigger a block, and subsequently, deliver a black screen in Vellum. Usually, our customers in China do not have issues but every once in a while, this will happen.
We recommend using a VPN on your device to access the wallpapers. We have users who have had success with ExpressVPN. There's a tutorial on how to change the app store country to download ExpressVPN in China. https://www.expressvpn.com/support/troubleshooting/change-app-store-country/