Gotcha, just a sanity check 
Looking at the Plug.Static module docs,
The preferred form is to use
:fromwith an atom or tuple, since it will make your application independent from the starting directory. For example, if you pass:plug Plug.Static, from: "priv/app/path"Plug.Static will be unable to serve assets if you build releases or if you change the current directory. Instead do:
plug Plug.Static, from: {:app_name, "priv/app/path"}
Have you tried it with the preferred form?
