A PDF file can be added as a link. It's possible to link PDF to text, image, button, menu link, etc... all these options work similarly. Below you can find detailed instructions on how-to embed a PDF into a text section. Please make sure that your PDF file size is below 22 MB, otherwise, we recommend using Google Slides to embed your file.
To upload & add a PDF to a text section:
Right-click on a text element
In the Context menu, click Change Content
Highlight the text that you want to link to
Click on the link icon at the top
Scroll down and select the option A PDF
If you haven't uploaded your file yet, click on the Select a File From Your Computer button and upload your file
Click on Link to This button near your uploaded file, and then hit Ok to save the changes.