unable to add attachments as an Approver in External Supplier Registration requests

Summary:

unable to add attachments as an Approver in External Supplier Registration requests

Content (required):

Hi team - i have created a external supplier registration request. and now as an approver, im trying to add some attachments in the supplier registration approval notification. but the Add option is disabled. can someone pls let me know what could be the issue.

Version (include the version you are using, if applicable):

22B

Code Snippet (add any code snippets that support your topic, if applicable):