You could only upload logos to the vault that were created by 19's in-game Logo Creator, NOT custom logos from outside sources like USB flash drives.
Stop and think for 2 seconds about the reasons why SDS doesn't allow imported logos from outside sources and 'why?' becomes painfully clear.
If you have a Logo in 19 that you want to use in 20 but didn't get uploaded to the vault, there's a way, but it's manual and it's a pain. Go into the 19 editor, load your logo, and then painstakingly record all the measurements and vectors associated with each piece. Then, go into 20 and re-create.