3288104 - Unable to attach PDF - Read error during PC upload: An error occurred when uploading to SAP Knowledge Provider

The following issue is being faced when trying to upload a PDF to a Sales Order or Billing Document:

"Read error during PC upload: An error occurred when uploading to SAP Knowledge Provider"

If you click on the "More Info" button, the message displayed is:

"An error occurred when uploading to SAP Knowledge Provider.

Check the following possible causes:

• The document may already be open in an external application.
  In this case, close the application and try again.
• The system was not able to access an external content server or an external archive."

This only happens with certain PDF documents. When trying to attach a different PDF, the upload works.

• SAP S/4HANA
• SAP S/4HANA Cloud

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