PDFs not appearing on mobile devices

So for the project my team is working on, the learners need to have access to two PDFs. We know they can be uploaded as Resources in Captivate Prime, but they would ideally be able to be accessed through the course itself.

We have Captivate 2019 and have tried using the Web object, hyperlinks (to open as a new window), and buttons (again, in a new window) and are publishing the project in HTML5. Every time we've tested it in Captivate Prime, the PDFs appear just fine on computers but fail to load at all on devices.

We've tried saving the course as both responsive and non-responsive, have tried manually placing the PDFs in the zip folders, and letting Captivate package the PDFs into the course itself. Nothing has worked.

Any help would be appreciated!