Susan M. okay thanks for raising. We also have this built into our chrome extension now in theory you shouldn't need to do this here anymore.
Lets say you are in Figma, if you have an icon you want to bring in - if you right click copy > copy as svg go to webflow, and paste, a menu should show up automatically that lets you choose what size you want the icon and it should paste in the embed element with the icon ready to go.
Let me know if that process doesn't work though I've been using it all week long with no issues.
I know you are a seasoned vet of Webflow/Relume, so apologies if I've explained something you already knew - happy to dig in deeper if you've run into issues with the process above or if there is a use case I might be missing.