I usually send some image files as PDF via e-mail, more transportable and easy to open and view and above all more universal as a standard file for a simple view.
I think it’d be useful to see in the menu File, a Save as PDF option, maybe also for a group of folders open in that moment for having got a single file. I know people that saves more images scanned in a single file PDF.
Menu –> File
then you can select
Save as…
Save as PDF
Save All as PDF