"S3 protocol" typically refers to object storage read/write/delete, not additional service APIs. Support in other S3-compatible vendors varies, often with a dif

"S3 protocol" typically refers to object storage read/write/delete, not additional service APIs. Support in other S3-compatible vendors varies, often with a different payload (though a translation wrapper shouldn't be too difficult to implement) https://developers.cloudflare.com/r2/buckets/event-notifications/ https://developers.cloudflare.com/r2/buckets/event-notificat... https://docs.digitalocean.com/reference/api/spaces-api/ https://docs.digitalocean.com/reference/api/spaces-api/