Thanks for the explanation, and for considering this request as a potential feature!
We post a lot of reports on our website, and the generated thumbnail is problematic in two ways. First, we experienced the dreaded “black box” problem with PDF thumbnails, and second, our stakeholders didn’t like that the generated images were difficult to read. In the past few days, we tested a solution that fixed the black box problem (PDFs need to be RGB, not CMYK). So at least for now, the thumbnails look reasonable. Our design team also supplies a zoomed-in, cropped version of the PDF cover to use as a featured image, which works fine when we are hand-creating galleries using Elementor. But the number of PDFs on our site is growing and we want to be able to select from them using tags and categories, so we’d like the designer-provided image to carry along with the PDFs when using MLA, too.
