Copying attachments failing when copying to Jira Discovery

[Gerard O'Neill]

Hey. I have some automation setup to create a new Idea into Discovery and to copy all relevant fields from a Service Project. Everything is working fine apart from the Attachments field. I am getting the following error:

Unknown fields set during create, they may be unavailable for the project/type. Check your custom field configuration. Fields ignored -

Attachment (attachment)

I've tried using the copy field from the Choose fields to Set and also "Additional Fields" with the following values:

{
"fields": {
"attachment": "{{triggerIssue.attachment}}"
}
}

My Discovery project has attachments as default so I am a little confused as to why it isn't working.

Any help would be appreciated

Thanks