I discovered something funky this past week. Setting up a camera I was mucking about with the Windows camera app and noticed it was unable to save images or videos, came up with a
filecreationfailed message.
Digging a little deeper it turns out MS changed the way libraries are linked in an update to 11 in recent times. In the past if you right clicked a library folder such as "Pictures", then went into properties you could map the folder to another location, so for me this would be the documents SSD I use where resides "Pictures" parent folder.
Seems because of the mapping change, whilst most other apps detected this and worked all fine, the Camera app did not and was expecting the new style of mapping, even though the old way is still a thing and used by everything else. Camera app just won't save unless there's a mapping added in the new area.
Both areas may always have existed in 11 though, it's just the behaviour of the new way has changed and is a dependency on core MS apps like Camera. The error doesn't make it clear what the main issue is, so you have to go digging manually which was annoying.
Old way:
New way: