Problem with applying pdf files to html under page properties to a main frame page

it looks like you're trying to apply PDF files to update the main frame created with FrontPage. Unfortunately, PDFs can't be directly applied to HTML frames.

You may need to convert the PDFs to HTML or embed them using an <iframe> tag. If you need specific guidance on converting or embedding, let me know!

PDF are not web files.  They are media files.

To view PDF, the user's device must have a supporting PDF viewer -- i.e. Adobe Acrobat or free Acrobat Reader.

For the best user experience, insert a web image (JPG, PNG, WebP or AVIF) on the page that browsers can display along with a text link to the PDF file for users to download and open in their favorite PDF viewer.

Example Code:

<img src="images/your_image.jpg"> <a href="some_link.pdf">Link to PDF (56 KB)</a>

What do you mean by applying a PDF file to an HTML page? And you also mention frames in your post and frontpage. Based on what you are sharing so far, your best bet will be to share the page you are having issues with so we can see what is going on. However, given that this is sounding like a very old frames based site made in frontpage, your best bet may be to explore a new template/theme/cms to bring your website up to more modern standards.