ServiceNow script to copy a specific attachment from one record to another

copySpecificAttachment.js

copySpecificAttachment(donorTable, donorID, recipientTable, recipientID, fileName);

function copySpecificAttachment(donorTable, donorID, recipientTable, recipientID, fileName) {
	var donorAttSysID,
		grNewAttachment,
		linkToNewRecord,
		attDataRecord,
		newDocRecord,
		grAttachment = new GlideRecord('sys_attachment');
	grAttachment.addQuery('table_name', donorTable);
	grAttachment.addQuery('table_sys_id', donorID);
	grAttachment.addQuery('file_name', fileName);
	grAttachment.query();
	while (grAttachment.next()) {
		donorAttSysID = grAttachment.getValue('sys_id');
		grNewAttachment = copyRecord(grAttachment);
		grNewAttachment.setValue('table_name', recipientTable);
		grNewAttachment.setValue('table_sys_id', recipientID);
		grNewAttachment.update();
		linkToNewRecord = gs.getProperty('glide.servlet.uri') + grNewAttachment.getLink();
		attDataRecord = new GlideRecord('sys_attachment_doc');
		attDataRecord.addQuery('sys_attachment', donorAttSysID);
		attDataRecord.query();
		while (attDataRecord.next()) {
			newDocRecord = copyRecord(attDataRecord);
			newDocRecord.setValue('sys_attachment', grNewAttachment.getValue('sys_id'));
			newDocRecord.update();
		}
	}
	//gs.print(linkToNewRecord);
}
function copyRecord(record) {
	var i,
		recordElement,
		recordElementName,
		recordTable = record.getTableName(),
		recordFields = record.getFields(),
		grNewRecord = new GlideRecord(recordTable);
	
	grNewRecord.initialize();
	
	for (i = 0; i < recordFields.size(); i++) {
		recordElement = recordFields.get(i);
		if(recordElement.getName() != 'sys_id' && recordElement.getName() != 'number')
		{
			recordElementName = recordElement.getName();
			grNewRecord.setValue(recordElementName, record.getValue(recordElementName));
		}
	}
	
	grNewRecord.insert();
	return grNewRecord;
}

This code helped me a lot! Thank you so much!

looks it wont work for scoped application?

@thisnameissoclever great script, but there is a problem with it if someone would use it in after insert BR on attachment table (i.e. when copying recently added incident from RITM to SCTASK). it creates an infinite loop of adding attachments because of line 19.
you can quickly fix it by adding another object to copyRecord, like that:
line 19: grNewAttachment = this.copyRecord(grAttachment, {'table_name': recipientTable, 'table_sys_id': recipientID});
line 25: newDocRecord = this.copyRecord(attDataRecord, {});
add between lines 46 and 47: var recordValue = Object.keys(fieldsToOverride).indexOf(recordElementName) > -1 ? fieldsToOverride[recordElementName] : record.getValue(recordElementName);
line 32: copyRecord: function(record, fieldsToOverride) {