P: Ability to disable Cloud-Sync

@David Converse my current iPad Pro has a 512GB drive and my hope is/was that with a version of Photoshop with the right functionality, a 1TB model could be a better mobile solution than dragging a laptop + AdobeRGB monitor around when clients want to inspect work on location. I'm not sure where you got the idea that iPads "don't even have that much storage". It may not be the 4TB my desktop rigs have but it would be enough to hold a couple of key files for that specific day. That is, if Photoshop on iPad was practical, which in this current form it is not. (For a variety of reasons; not being able to disabled syncing is just one of many.)  

But yes, the files I tried with mobile Photoshop as a test run weren't even close to the biggest files I work with and it still bogged down the connection. I don't want to be constantly uploading and updating a 1GB file, let alone a 100GB one.  

@David Illig Close guess, but it's a Phase One XF and IQ3 101mp back; soon we're all moving to IQ4 151mp backs, though personally I'm pushing to use the IQ4 101mp Trichromatic back. For me stitching several 101mp files vs stitching several 151mp files isn't really any different, but the more accurate colour out of the box will save more time. 

But in any case, yes, stitching several >100mp files and then doing global edits on top, which need to each be done on individual layers so picky clients can see every combination of adjustments, adds up to file sizes rarely below 20GB and on some occasions over 300GB. I'm sure everyone can understand why having that constantly uploading is a problem, why storing and downloading that amount of data off cloud services isn't worthwhile (and on the rare times we do utilise such systems, we sure aren't going to use Adobe's cloud offerings and legally could not even if we wanted to), and why having to manually take the iPad offline each time you open Photoshop is a tedious chore which could very easily be avoided simply by providing an option to just disable Photoshop's uploading.

@David Converse Well, @Sebastian Matthews doesn't say that he has worked on such files on the iPad at this time. And I suspect that Photoshop for Mobile is using Smart Previews of the files that are in the Document cloud, just as Lightroom CC does. Edits applied to the Smart Preview are then automatically applied to the full-resolution image in the Document cloud. Major-league panoramas with many layers could be very large. Also many layers on the 100 MP Hasselblad Hasselblad H6D-400c MS. In any event, a cloud-based system where cloud storage is expensive is not the right solution for such large files.