Automatically attach PDF files stored in a Library to their respective items in a List

Hi All,

I have a SharePoint list with records, and one of the columns (AttachedDocuments) contains the file
names of the corresponding PDF attachments. I want to automatically attach these PDF files (stored in a Share Point document library) to their respective list items.

I've created the attached Power Automate Flow however it doesn't seem to work.

Could someone point out where I'm going wrong or suggest a alternative solution?

Thanks