Same here, no amount of waiting made it load. Copied the URL to my phone's browser and same thing. Turns out it's Imgur blocking my VPN connection, pausing the VPN made it load. It may also be your case. Happens on other clients too with Imgur images.
Discussion
nostr:npub1gcxzte5zlkncx26j68ez60fzkvtkm9e0vrwdcvsjakxf9mu9qewqlfnj5z maybe make the default choice for file server not Imgur when uploading images? One that doesn't block VPN connections? I know one can choose from the drop-down list but most just use the default.
Update: seems like setting the VPN protocol to UDP allows it to load, while in TCP or NordLynx it doesn't load. Defaulting to a VPN friendly file server is still a must imo.