I’d like to send a screenshot but like I mentioned I deleted them all. Size shouldn’t be an issue but it is. I was also under the impression that Memories just contained links to photos and videos, but that does not appear to be the case. I’m not brilliant in general, but I was a software engineer for 30 years so in terms of selecting Memories and hitting the Info button I feel pretty confident. I can’t believe Apple would implement this as a copy rather than links and then not allow us to turn it off. I’ll enable Memories again to see if I can screenshot what I’m seeing.
EDIT:
So it appears if you choose Movie at the bottom of the screen and then click on the music button to change the song, it will save the Memory. So some of the large Memories were likely created like this although I know I had many very large Memories called Summer or Fall that were definitely auto-generated.
Here is a screenshot with just 7 Memories. Admittedly there are many 4K videos in those Memories:
View attachment 2429073