I have been uploading a PDF into Marketo for users to download on a Landing Page.
When I upload it to the images and files area it is saved as test/html and thus won't render or download correctly in browsers.
I can't see how to edit the file type or set it on upload. The file has a PDF extension btw.
Did you ensure that there are no spaces (only dashes) in the file name?
Also, did you test this in browsers?
if it is still listing it as text/html, even after deleting and replacing, call support.