XD : How to recover library source document if missing

I published a library full of typography, and it's been working well for months. But now that I want to edit it, I can't find a source file in the cloud or on my computer (can't remember exactly how I created it, whether it started as a local file or a cloud file, but I think it was a cloud file).

Is there a way to recover the source file so I don't have to recreate the whole library?

{Title renamed by MOD}