S3 API: `403 AccessDenied: Signature does not match` with Rclone (`provider = Other`)

Hi team,

I configured Appwrite Cloud S3 as an S3 remote in rclone using provider = Other:

• Endpoint: https://sfo.cloud.appwrite.io/v1/s3
• Region: auto
• Access Key ID: <Project ID>
• Secret Access Key: <API Key>
  (See attached screenshot for exact config)

Whenever Rclone attempts to list (ListBuckets / operations/list), it immediately fails:

{
  "error": "error in ListJSON: operation error S3: ListBuckets, https response error StatusCode: 403, RequestID: 8f0fcfbdd36afa8e, HostID: , api error AccessDenied: Signature does not match.",
  "input": { "fs": "appwrite unrollit:", "remote": "" },
  "path": "operations/list",
  "status": 500
}