How to Configure Cloudflare R2 for your Discourse Community

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For multisite, for my understandingwhat you are are already doing, you want only one instance using R2. If your settings are in admin settings. You need to use USE_DB_S3_CONFIG=true with RAILS_DB=default for it and will work like a charm

hooks:
  after_assets_precompile:
    - exec:
        cd: $home
        cmd:
          - sudo -E -u discourse RAILS_DB=default USE_DB_S3_CONFIG=true bundle exec rake s3:upload_assets
          - sudo -E -u discourse RAILS_DB=default USE_DB_S3_CONFIG=true bundle exec rake s3:expire_missing_assets

For migration of uploads you need to export these variables like below or one by one.

RAILS_DB=default \
DISCOURSE_S3_REGION=auto \
DISCOURSE_S3_ENDPOINT=https://<account-id>.r2.cloudflarestorage.com \
DISCOURSE_S3_BUCKET=discourse-files \
DISCOURSE_S3_ACCESS_KEY_ID=<your-access-key> \
DISCOURSE_S3_SECRET_ACCESS_KEY=<your-secret-key> \
rake uploads:migrate_to_s3

If you are planning on putting it in app.yml make sure to use DISCOURSE_S3_BUCKET because there is typos in R2 section of Configure an S3 compatible object storage provider for uploads