Mongo.GridFs.Download.find_and_stream

You're seeing just the function find_and_stream, go back to Mongo.GridFs.Download module for more information.
Link to this function

find_and_stream(bucket, file_id)

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Specs

find_and_stream(Mongo.GridFs.Bucket.t(), String.t()) ::
  {result(), BSON.document()}

Same as above, but returns also the file document.