Thanks for the reply. I am on 1.7.1.143 I converted the same two images to dng and tried to open them:- unsucessfully. Now have 2 each of 2 raw images in photos on iPad. Unfortunately, I don't know which are sony raw and which are dng's. Anyhow, I tried opening them again and managed to open one file out of the three, it opened in develop persona and I was able to play about with it. I am not ruling out glitches in the apple beta os, or my method of transferring the images to the iPad. I will need to get my Apple photos on my mac book sorted and buy some cloud space to see if it helps by syncing the library. I do not want to have to rely on internet to get my images though, which is why I am playing about with SSD and this beta OS. Here's hoping.