Upload
A class that represents a file upload in a multipart upload See https://github.com/jaydenseric/graphql-multipart-request-spec
Use this to map your upload custom scalar and the apollo runtime will be able to extract them and send them out of band.
In your build.gradle file:
mapScalarToUpload(Upload)
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If you have a JVM File at hand, see also com.apollographql.apollo3.api.DefaultUpload.Builder.content