Hi @Phoenix85 ,
The error seems to be correct - as shown in your first screenshot the "local" storage is not configured to accept content type "Disk Image", which is what the Virtual Disks are called in PVE.
Fabián Rodríguez | Le Goût du Libre Inc. | Montreal, Canada | Mastodon
Proxmox Silver Partner, server and desktop enterprise support in French, English and Spanish
OP's issue is "working" storage. As the message says - during the import the space is needed on working storage. And OP's working storage is set to "source". I have a suspicion that "Working" storage for File import needs to be File-based - as stated in the error message.