[Zubersoft]

Exiting the annotation editor will save the changes automatically. Until you exit the annotation editor, the image you created using the snipping tool will be editable, so you can move it around or delete it. Once you exit and save, it will be saved to the PDF, and will no longer be editable unless you enable the option in the annotation settings to enable editing of embedded PDF annotations. Switching between pages while annotating won't cause the image created with the snipping tool to be written to the file, but it definitely shouldn't disappear. If you are seeing that, it may be a bug. I will investigate. In the meantime, you may want to paste the image, exit the annotation mode, go back in and make further edits.