The full price for Mono will be $69.
Mono is for now limited to a single source and two destinations, as the iPad doesn't really pack the punch to do more. We're testing all iPad models, and if it becomes feasible to add more than one source or more than two destinations, we'll definitely add the possibility.
For that, you'd need to add them to your Camera Roll first, and make sure the iPad supports the format you are using. Don't bet on a lot of codec support from Apple on iPadOS.
All within Files, and none within Mono. We still don't do vendor lock-ins 😁
Folders too, and even files - just like with Hedge.
Yes, although not as deep as Hedge's dupe detection as the iPad doesn't reliably allow for modification date comparisons. Thus, dupes are checked for filename, size, and of course file path.