I just setup proxmox, and am testing out various features. I needed to upload an ISO so I can install an OS. took me a bit so i figured I’d throw it on here for future ref. Login to proxmox web control panel. Goto server view from drop down on left hand side. Expand datacenter menu until you see local then click it Right hand side select COntent tab click upload button Click select file, find your ISO, click upload. This should solve any proxmox iso upload questions that may arise 🙂 Update to add a screenshot below.