Skeletal meshes cannot save vertex color paint.

Hi, can anyone solve my issue? When I do vertex color painting on the skeletal mesh I can’t click the apply button, it only has a save button available. When I finish drawing the vertex colors and click the save button, the vertex colors I drew before restarting Unreal Engine and reopening the project disappear.

Is the problem solved?
I had the same problem and it only occurs in this version(5.4)!