Maybe/config/storage.yml

local:
  service: Disk
  root: <%= Rails.root.join("storage") %>

test:
  service: Disk
  root: <%= Rails.root.join("tmp/storage") %>

amazon:
  service: S3
  access_key_id: <%= ENV["S3_ACCESS_KEY_ID"] %> 
  secret_access_key: <%= ENV["S3_SECRET_ACCESS_KEY"] %>
  region: <%= ENV["S3_REGION"] || "us-east-1" %>
  bucket: <%= ENV["S3_BUCKET"] %>

cloudflare:
  service: S3
  endpoint: https://<%= ENV['CLOUDFLARE_ACCOUNT_ID'] %>.r2.cloudflarestorage.com
  access_key_id: <%= ENV['CLOUDFLARE_ACCESS_KEY_ID'] %>
  secret_access_key: <%= ENV['CLOUDFLARE_SECRET_ACCESS_KEY'] %>
  region: auto
  bucket: <%= ENV['CLOUDFLARE_BUCKET'] %>

# Removed in #702.  Uncomment, add gems, update .env.example to enable.
#google:
#  service: GCS
#  project: <%#= ENV["GCS_PROJECT"] %>
#  credentials: <%#= Rails.root.join("gcp-storage-keyfile.json") %>
#  bucket: <%#= ENV["GCS_BUCKET"] %>

#azure:
#  service: AzureStorage
#  storage_account_name: <%#= ENV["AZURE_STORAGE_ACCOUNT_NAME"] %>
#  storage_access_key: <%#= ENV["AZURE_STORAGE_ACCESS_KEY"] %>
#  container: <%#= ENV["AZURE_STORAGE_CONTAINER"] %>