Serving static files in Cowboy (Erlang)

Question

I read this guide https://ninenines.eu/docs/en/cowboy/2.0/guide/static_files/ and I implement

{"/assets/[...]", cowboy_static, {dir, "/var/www/assets"}}

in my tunnel_app.erl file:

-module(tunnel_app).
-behaviour(application).

-export([start/2]).
-export([stop/1]).

start(_Type, _Args) ->
  Dispatch = cowboy_router:compile([
    {'_', [
    {"/info", lobby_handler, []},
    {"/join/:name", join_handler, []},
    {"/player/status/:name", player_status_handler, []},
    {"/tables/info/:table_id", table_info_handler, []},
    {"/tables/play/:table_id/:name/:auth/:action/:x/:y", table_play_handler, []},
    {"/assets/[...]", cowboy_static, {dir, "/static/assets"}}
    ]}]),
  {ok, _} = cowboy:start_clear(my_http_listener, 100,
    [{port, 8080}],
    #{env => #{dispatch => Dispatch}}),
  {ok, MainDoor} = door:go(),
  register(main_door, MainDoor),
  {ok, MainRoom} = room:go(),
  register(main_room, MainRoom),
  tunnel_sup:start_link().

stop(_State) ->
    ok.

I have my files in static/assets:

~/tunnel/ls static
assets
~/tunnel/ls static/assets
actions.js      dashboard.js        hole.js         player.js       tableview.js
board.js        display.js      http.min.js     script.js       tile.js
callback.js     engine.js       info.js         style.css       view.js
client.js       engine_client.js    moves           table.js
clock.js        game.html       notes           tablemaster.js
color.js        ground.js       oboard.js       tableproxy.js
~/tunnel/

When I navigate to

http://localhost:8080/assets/game.html

My browser gets a 404.

EDIT:

The root path of the project is /users/quantum/tunnel with /users/quantum/tunnel/src being where all the `.erl files live.

I tried changing the path to "{"/assets/[...]", cowboy_static, {dir, "/users/quantum/tunnel/src/static/assets/"}}"

and navigating to localhost:8080/assets/game.html shows nothing (not even 404)

Aha! I made a mistake in the path - static is in the root of the project, not inside src.

{"/assets/[...]", cowboy_static, {dir, "../static/assets/"}} does not work nor does static/assets, however:

{"/assets/[...]", cowboy_static, {dir, "/users/quantum/tunnel/static/assets/"}} does work.