With iOS11 Apple seem to have changed things yet again. I have some photos in Photos (Apple) on my iPad. The only way they could have got there is by my emailing them to myself and then importing them to Photos. Earlier it was possible to then import from Photos to AP on the iPad. This route doesn't seem to be possible now.
I am very reluctant to turn the iCloud on - I know that "everyone" else uses it - but I absolutely don't want to. Despite what Apple and others say, I don't trust clouds, and I have confidential data on some of my machines so I don't want to run any risk that it could migrate. I know that that happens.
So now I don't seem to have any very easy way which I trust to get images into AP on my iPad, so I'm reverting back to using AP on my MacBook Pro. PIty - as some of the features in the iPad version seem a bit eaier - once the UI has been figured out. The tutorials for all the versions are excellent. I really wanted to make up a new composite photo using the concepts from the Sky replacement tutorial - though my application is to replace a blown out (overexposed) window which is "framing" some people in a room with a better background. I looked at the tutorial about using the iOS 11 "file system" - but it hasn't helped in this instance - seemingly because of the way Apple have now configured the iPad.