Image asset studio has No Legacy tab

1. Above is the official crop of image asset studio.
When you choose "Launcher Icons(Adaptive and Legacy)" as icon Type , there is supposed to be a Legacy tab, however, it didn't show on my studio. Anyone might know why?

2. What would happen if I upload a 512*512 dp image to foreground layer for adaptive launcher icon? (The official guideline says it must be at 108*108 dp)

Thank you.