Why does my file say “Error opening file”?

File won’t open … I use Dorico on an iPad and there is no backup folder in the Dorico file. If the file is corrupted, I want to know why since I didn’t do anything out of the ordinary on the device or with the file. Also want to know why there’s no backup folder even though I’ve paid for the full version of Dorico. I hope it’s fixable! File should be attached.

Super.dorico (145.3 KB)