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Hi, where do I find an example for file upload implementation?

Apollo file uploads are not part of the GraphQL specification and are not supported "out-of-the-box". As per <https://github.com/ExpediaGroup/graphql-kotlin/issues/518|#518> you will have to configure Jackson object mapper to correctly handle those types (and potentially also configure custom data fetcher to apply the custom logic - if needed).

There are some examples linked in other related issues <https://github.com/ExpediaGroup/graphql-kotlin/issues/661#issuecomment-616560182|#661 (comment)> and <https://github.com/ExpediaGroup/graphql-kotlin/issues/518#issuecomment-617022276|#518 (comment)>