Those are supposed to transfer over automatically. It only happens after a trade is accepted and then marked shipped. Then cards marked as shipped will move to In-Transit until you mark them as received when they will transfer into your Collection. If those steps have been fulfilled, then something is wrong. If you are trying to do it ahead of the trade, you are jumping the gun and it's not going to be good if you actually complete that action before letting the trade proceed correctly.
We need more info if these are not the "problem".
NO PWE's EVER!!! PLZ PM me 1st before sending any offer. ONLY selling cards as of March 2024. No trades or purchases right now.
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Largest total PC card collections by Team, then Athlete (as of 3/22/24):
STL Cardinals (MLB) - 8810; Carolina Panthers - 2888; GB Packers - 1790+ cards
Mark Martin (NASCAR) - 2038 cards; Jimmie Johnson (NASCAR) - 1875 cards; Jeff Gordon (NASCAR) - 1594; Ricky Rudd (NASCAR) - 839; Ozzie Smith (MLB) - 707