Yes, this has always been an issue since ACY moved to versions 7 and 8. This is the only thing about ACY for the most part that is not good. This is a common function that everyone needs and it's crazy that ACY doesn't give the ability to make it easy to link to a PDF inside the block editor. Why isn't there an upload file vs image feature.
Hard to expect my clients to upload the PDF first in an article then grab the url + add the domain name, then go back into ACY and insert the link. Just crazy. Maybe instead of working on new features that are not basic, work on something that every other email marketing platform has.
I know there is an attachment function, but we recipients don't look for that, and we need links inside the email to go to documents.