aws s3 for file storage:
https://github.com/corsego/20-active_storage/commit/ea323d39058add4aa46868b7baf4c2d91550e60d

ActiveStorage docs:
https://edgeguides.rubyonrails.org/active_storage_overview.html
How to use Credentials in Ruby on Rails 6? TLDR:
https://blog.corsego.com/ruby-on-rails-6-credentials-tldr

0:00 The Problem
02:01 Install AWS S3 cloud storage
05:19 AWS IAM
08:35 Local storage = S3
09:13 gem aws-sdk-s3
11:05 Production
15:42 Summary