Something unexpected happens with the [%1$tM:%1$tS]. As per the documentation, that’s the proper format, but the substring is also included in the label, which isn’t what I wanted to achieve, obviously.
The pattern isn’t correctly integrated… I assume this no longer works…
stateDescription is meant to be a replacement for the old method of putting labels in names. However, labels still work since there are lots of people still using them. You can’t have both at the same time, so remove one or the other.
Are you sure you’re showing the item created from file input ?
It should show a lock symbol and a text saying "Note: This Item is not editable because it has been provisioned from a file. " which it doesn’t in your post.
So seems that’s the UI-provisioned version. If so, delete it.