Apologies for the inconvenience caused to you due to this issue.
Unfortunately we are not able to reproduce this issue. Could you kindly provide the following information to help us nail this down.
When this issue occur please share the AID file with us without closing illustrator.
1) If you are using Adobe Illustrator 2020 , Could you kindly share you AID file with us in a zip file. You would be able to find the AID file in preferences folder in the below location:
MAC: /Users//Library/Preferences/Adobe Illustrator 24 Settings// DataRecovery/ (Kindly press Command + Shift + G and write ~/Library and ok and then go to preferences )
Win: C:\Users\\AppData\Roaming\Adobe\Adobe Illustrator 24 Settings\ \x64\DataRecovery\
Kindly share the above with us in a Zip file at email@example.com. Please mention the title of this issue as the subject of the mail.
An error occurred while saving the commentMatt commented
I had the problem of the images disappearing when I embedded them. The way I worked around it was opening the photo in photoshop and then dragging the image into illustrator and that seemed to work. Try that.