Thank you for the post - I understand so much more now about why a customer resolver is needed and what VTL is and how it's used in AWS. My only question is, if I have an existing schema, and existing mutations generated by Amplify, do I add the new batch mutation to my mutation file? Or do I follow exactly as you've done which is to add mutations and queries to my schema file which currently only contains types? Thank you again! Much easier to understand than the Amplify docs (Sorry AWS!)