Serving .well-known/apple-app-site-association Works in Development env but returns Phoenix.HTML.Safe error in Release

Thanks yeah the error-catching was fully broken. But I fixed it all and I was actually getting a 404 in prod(I believe because I was placing the files in priv/static, which dev could find but not prod … could be a copydir issue while building the release docker image, not sure yet).

I’m getting the files now but I have to place them in assets/static and I manually added the literal names in the only: clause in the plug in endpoint.ex:

  plug Plug.Static,
    at: "/",
    from: :faithful_word_api,
    gzip: false,
    only: ~w(css fonts images js favicon.ico robots.txt apple-app-site-association assetlinks.json)

(not using .well-known at the moment, apparently you can optionally place them at webroot).
Thanks for putting me in the right direction.