Usd geometry cache

Hello ,
I’m annoyed with usd things , i import an usd file with animation in it into unreal 5.4 with the usd stage , i tweak the materials everythings is great , but if i close unreal and re open it , the geo is not there anymore , its look like the geometry cache is the problem , is there a way to save it ?
i ‘ve try the option at ’ load’ in the usd stage editor but then i can’t tweak the materials
Thanks