Hi @HelenR
Great question and welcome to the community!
In my opinion, Pop ups can feel more noise, especially when users are already swatting away things like cookie policies, 10% off, or sign up to push notifications pop-ups. They often look like they’re triggered at the site level, not connected to the content someone’s actually engaging with.
An embedded form, on the other hand, feels more intentional. It’s part of the page, part of the story, and makes the sign up feel like a natural next step without any distractions. You have done the hard part, getting them to the page, so don’t push them away with something intrusive, but do make the process super easy for sign up on the landing page.
Have a super simple embedded sign up form on the page, then as @RachelF mentioned, build your flow with the “added to list” trigger and include the PDF in the email.
It’s all about keeping the experience aligned with why they came to the page in the first place.
Thanks
Tim