I have documented it:
Connecting securely to Oracle Object Storage bucket with S3

@kaihoku: Thanks for sharing this.

@wattpuppy: OCI Object Storage works with WinSCP GUI fine. When setting up the connection do the following:

• Use the S3 compatible endpoint with port 443:
  {object-storage-namespace}.compat.objectstorage.{region}.oraclecloud.com
  
• Click the "Advanced" button
  Set the region again here
  Set the URL style to Path
  

You should be able to view objects, upload/download objects. Used it today.

I haven't found any GUIs that support Oracle Cloud Storage. I would love support in WinSCP.

Do you want to use WinSCP GUI or scripting? If GUI, were you able to use any GUI S3 client against the Oracle Cloud? GUIs have different requirements than command-line clients.

I'm currently using RCLONE to sync files.

I did some tests. While I was able to connect and see the buckets, I could not see files nor I was able to transfer any. But I had similar problems even with other S3 clients. It does not look like Oracle Cloud has good compatibility with S3. Were you able to use any S3 client against Oracle Cloud successfully?

What kind of support does it need? If Oracle supports S3, you should be able to just specify the Oracle endpoint on WinSCP login dialog.

Would it be possible to add support for Oracle Cloud Object Store S3 buckets?