Copy card when label added creates duplicates

[Daniel Hultmann]

Hello,

Structure: we have client boards and we have boards for each deparment.

Automation: We want to be able to add labels to a card in order to send that card to the specific department (Graphic label goes to graphic board).
"when the green "Bestil grafik" label is added to a card, copy the card to the top of list "Ny grafisk opgave" on board "Grafik - Opgaver" and link the cards together"

The problem is that when we do that, we want to keep the Trello attachments on the card, but doing so makes it duplicate (so if theres 5 trello card attachments it duplicates 5 times).

How do I prevent it from duplicating?