OK, Adobe do not want you to use Google or any cloud but their own when importing images into PS Touch. Selfish and very naive. It limits what could be a great app and turns it into nothing more than a occasional plaything. But there is a way.
Install SketchBook Pro. This app will link to just about anything, these people know how to please, import your image and save it locally. You can then open it in PS Touch. Simple. Doesn't take too long, and until Adobe accept the fact there is a big wide world out there, will do the job.
To be fair, Creative Cloud does give you 20 GB of space for free. (Yeah, it's another account to manage but then again I have multiple accounts with different services anyway.)
I have SketchBook Pro as well; it's a drawing app. It does its job quite well being a drawing/illustration app but it isn't Photoshop which excels at image editing. (I understand some digital artists use Photoshop to draw but that's always seemed like a little overkill to me. Meh.)
Not quite sure you have grasped the point, but thanks for the reply.