For issues you find with the Switch and Console releases, please follow this link and give as much detail as possible. This is the speediest way to get info to Pipeworks and get a hotfix in the works.
For issues you find with the Mobile 1.3 update, please follow this link and give as much detail as possible. This is the speediest way to get info to DR Studios to look at your issue. Also, some troubleshooting hints here.
Does it? Someone sent me a few files from Switch version recently and I've been looking at them but they had extra fields in a bunch of places so the result was a bit gibberish (and it was hard to explain what I needed to figure that out)
On format, it's encrypted with a fixed 128-bit AES key (you can find which one via forums or ILSpy); I posted the Haxe version of my implementation here at some point.
I've been slowly poking around with a complete rewrite of the tool - if you have one or more mobile versions and are willing to contribute save files/notes, you can reach me on Discord - YellowAfterlife#3735
To those whom it may concern, iOS/Android saves now work alright (with obvious caveats as per game's policy) while I'm still getting around to Switch support. Not that it would be practically usable for an average user (not unless the game's policies change and import/export are similarly allowed), but it's an interesting task to tackle.