Your Gmail signature image or logo may sometimes disappear all of a sudden.
This issue can be really confusing, especially if you havent changed your permission controls recently.
Try setting up your Gmail signature image again and see if the issue persists.
If the problem wont go away, follow the troubleshooting solutions below.
Save the new signature format and peek if the issue persists.
Then, reinsert the problematic image or logo.
Save the signature and exit Incognito Mode.
Unfortunately, there are times when the privacy permissions fail to change and you oughta do that manually.
The most important thing is not to delete that image from your Google Drive account.
If you do that, the image will disappear from your Gmail signature.
Alternatively, go to Gmail prefs and insert the image directly from your Drive folders.
Additionally, stash your signature logo or image in a different format and upload it again.
If the image is stored in Google Drive, edit your privacy options so that everyone can view it.
