Thanks in advance for help. Moving to Pixelmator from Photoshop. A key part of my workflow in PS was Shift Cmd Copy (Mac) which copies visible and then paste to new document (this is an a4 page of images to layout and print from). I can't seem to do this in Pixelmator.
As part of trying to resolve this I've tried to create a new 7cm x 7cm transparent doc with a stroke Inside outline. When I copy this to a new A4 doc the square is filled white, not transparent. Very confused.