Hey @mrgas – your mint most likely went through successfully. Based on what you’ve described, this sounds like it could be related to a known issue with the arweave.net gateway returning 404 errors, rather than the metadata not being uploaded. You can read more about it here: Token Media Not Displaying on Marketplaces / Token Metadata Returns a 404
To confirm, could you share the OpenSea link to your collection or token? That’ll let us check the underlying Arweave transaction and verify whether the data is accessible via alternate gateways.