Chaves

Hey guys, Is it possible to load boxes from previous games (SwSh and UsUm) into BDSP ??? I'm trying to load some pokemon into it, but its not working at all. I did this before with games from previous generations, but the thing is, pokemon files from BDSP are ".pb8" while the ones from SwSh are ".pk8", so that may be the problem...? when i try to load Pokes from Shield it says "no files loaded". So is there any way to bring then to BDSP ??