Services - Appending or Clipping from PDFs

I have recently become familiar with the option of using the services to add text to a Scrivener project using the shortcuts from the services menu. However, I have not been able to make the Mac OS Services menu shortcuts work in my system. I am using Mac OS Big Sur, but these did not work either in Catalina. The PDFs are not text files and are not protected for the copy and paste features. I can normally copy using the command-C and command-V options. But using the shortcuts to append to note, append to text; or new clipping, I always get the error messages in the image. Those shortcuts work well from .docx or .doc files.

Do we know whether this is a bug, or would it be a setting in my system causing it? Thank you for any help you can provide on this matter. The screenshots are below.

[attachment=1]Screenshot 2020-11-23 at 16.28.21.png[/attachment]

[attachment=0]Screenshot 2020-11-23 at 16.29.10.png[/attachment]