Now I see what the issue was. Thanks for the hint @texnixe!
I’ve been using the pagebuilder plugin as well and had created a download-block for my customer.
Turns out they used that block to upload the files instead of selecting them afterwards.
I just had to assign the template to the download block via uploads: intern
Is there a way for me to assign a template to the files after the fact?
Because right now it seems like there are a lot of pages that’d need to have the files reuploaded to receive a new template.
Your best bet would be to go through the files programmatically and assign the template. Question is if you need the section if your users prefer uploading via the field.