Mass import attachments from bitwarden to vaultwarden

Hi guys. I am new to Vaultwarden. Because my NAS crashed I had to setup a new homelab and switched form Bitwarden to Vaultwarden. I installed vaultwarden in proxmox. I have eported my passwords and attachements from Bitwarden (it is an older backup). I was able to import the json file to Vaultwarden so far. What I then did was, I copied the contents from the attachement folder from Bitwarden to the attachment folder to vaultwarden. I was expecting that this works but it didn’t. Not a single attachment is linked to a password entry. Is there a way to import hundreds of attachments without uploading them by hand again?