Can't get rid of previous cover image

I’m compiling different parts of a project as book installments, using a different cover each time. Compiling installment #2 as ebook worked fine, but when I try to compile as pdf with the new cover, the old cover keeps appearing before the new one. I’ve tried moving the first cover out of the front matter folder (the first cover still appears) and replacing the first image in the text file containing the cover with the new image (nothing appears). Only the new cover file appears in the compile list, so I don’t know how the first cover is being pulled in. Any thoughts?

I also tried creating a new front matter folder with new files, but the old cover still appears first.

“Never mind!” Just saw that I had the old image specified in the Compile cover image tab, replaced that, and all is good.