Thank you @abhimanyusinghgaur for your kind thought-out responses. I think I understand this issue now and you might be right in saying that the real question to ask is: Can dgraph-graphql support file up-/downloads?
And if the answer to that will be yes, this would be totally awesome because we could ditch all this cumbersome custom code for attaching (and retrieving) binary data to/from the graph.
Should we maybe open a new issue regarding this? What do you think?