Hello Don!
I hope you are doing well. Thanks for sharing the steps that worked for you. We are glad that you were able to add the signature to the PDF.
As our community product expert correctly highlighted in the above response, this often happens with scanned or image-based PDFs, where the document is essentially treated as a flat image without recognisable form or text elements. Adobe Sign requires an underlying structure (like text layers or editable objects) to properly place signature fields. That’s why you’re able to place fields on some files but not on certain scanned ones.
Root Cause: Scanned documents often lack the necessary layer metadata that Acrobat’s eSignature tool uses to anchor fields. These files can appear editable, but don't directly support interactive form field placement.
If you prefer to keep everything on one page, you can: Use “Scan & OCR” > Recognize Text to convert the image-based content into a searchable layer. Save the file and try again with “Request eSignatures.” For more information, please see these articles: E-signature fields
https://adobe.ly/4cFsg4W
I hope this helps, and feel free to reach out if you need any assistance.
Thanks,
Anand Sri.