Backup to Cloudflare R2 using AWS Cloud Provider

OS type and version Ubuntu Linux 22.04.1
Webmin version 2.001
Virtualmin version 7.2-1

Has anyone successfully set up Cloudflare R2 as their backup solution?

I am able to backup small virtual servers, but my backups error out as soon as the file size reaches more than a few hundred MB.

In the error log there are hundreds of gradually incrementing lines that look something like this:

Completed 57.0 MiB/307.3 MiB (10.5 MiB/s) with 1 file(s) remaining

The relevant part of the error log is this:

Completed 120.0 MiB/307.3 MiB (4.2 MiB/s) with 1 file(s) remaining upload failed: ../../../../tmp/.webmin/387023-/ to s3://example-backup/test/
An error occurred (ServiceUnavailable) when calling the UploadPart operation (reached max retries: 4):
Reduce your concurrent request rate for the same object.

I thought this might be related to the chunk size (default 5M) but increasing this to 500M had no effect. Any suggestions?

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