Imported site images in wp-content 404 (Lightning)

I’ve imported a site that’s hosted on Pantheon, which required some fiddling. I’ve got the site imported and working, except that images don’t work. The files are there in my filesystem (WSL and the explorer) but they 404 when I try to open them in the browser. Uploading a new image to the media library works as expected. I’ve tried dinking around with setting permissions, but that hasn’t helped anything.