Hello @PeterA8569 ,
Can you elaborate any further on where you're running into issues? I was able to easily switch out the document link in my own emails, both for documents I already had loaded, as well as for newly-uploaded ones from within the editor screen. I also had no issues when replacing the first page image of the document in my email.
Is your issue with wholly replacing the document in your Library - keeping the same URL but plugging in an entirely different PDF? Or are you encountering your issues when simply editing the links/buttons and images in your email?
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