Unable to download media from iCloud in Messages App

I have an iPhone 14 Pro running iOS 27. I have a subscription to iCloud and use it to back up my content. When I access some of the media in the messages app, I can see the thumbnail, but I am unable to view it in full resolution. When I try to download all the media, either through system settings for iCloud, or within the messages app itself, I get a message saying that an error occurred. Have I lost all the pictures and videos stored in the messages app? Or is there a way to overcome this error and download them?