what is the route you’re trying to reach? does it have a corresponding file in priv/static/waffle/uploads? please post the full error message if possible
Where are you putting your plug? I can only reproduce your error if I put the plug in my :browser pipeline in the router. If I put it in the endpoint (where it should go) then it works fine for me exactly the way you’ve written it.
Yes, I am putting it in my endpoint.ex.
This looks like it’s at the end of the file, after your router. Your router must be your last plug in the file 
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I have the same problem.
