ExAws.S3.initiate_multipart_upload

You're seeing just the function initiate_multipart_upload, go back to ExAws.S3 module for more information.
Link to this function

initiate_multipart_upload(bucket, object, opts \\ [])

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Specs

initiate_multipart_upload(
  bucket :: binary(),
  object :: binary(),
  opts :: initiate_multipart_upload_opts()
) :: ExAws.Operation.S3.t()

Initiate a multipart upload