Phil,
I am having the SAME issue! I know for a fact that years ago, I was having this problem and was able to set make the following change:
From WordPress, go to SEO>Search Appearance
Click on the ‘Media’ tab
Toggle the ‘Media & attachment URLs’ to ‘Yes’
?Click ‘Save Changes’
However, in this recent update with Yoast or WordPress, not sure which one, it’s already toggled to “Yes” and I’m still having the issue.
What was the fix for this????
Serena