rails javascript file not found in assets/javascripts

Question

I am trying to install a plugin called Chaffel.js, I have added it to my javascript file

+app
|+assets
||+javacripts
|||chaffle.min.js
|||

I have required it in application.js

//= require chaffle.min.js
//= require rails-ujs
//= require turbolinks
//= require_tree .

And I have also added this to config/initializers/assets.rb

Rails.application.config.assets.precompile += %w(chaffle.min.js)

And I have included it in my view

<%= javascript_include_tag 'chaffel.min' %>

And have added all the html / javascript it showed for the example but when I load up the view it gives me this error

Sprockets::Rails::Helper::AssetNotFound in Home#index
The asset "chaffel.min.js" is not present in the asset pipeline.

I don't know if it is a problem with my asset pipeline or if the plugin just doesn't work anymore (As the cdn src on its page doesn't seem to work either) Would love some help with this or recommendations for a different plugin/way to achieve the same effect (a text shuffle animation).

I was able to get it working in a normal html file by just directly including the file via

<script src="chaffle.min.js" charset="utf-8"></script>

So it is definitely a problem with my code / the asset pipeline and not the plugin.