Hi @Tevon2.0
Do you want to insert link other address link in picture on sharepoint 2019 and address point to PDF file?
In SharePoint 2019 site page, there is no direct option to add hyperlink to image using out-of-the-box.
But you can try to use web part page, wrap the img tag with A tag, and the A tag points to the PDF file
<a href="URL_HERE">
<img src="IMAGE_URL_HERE" alt="Image" />
</a>
Here is test result:
If the above methods do not work, try alternatives:
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Best Regards
Cheng Feng