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Whenever I try to migrate using Sippy to R2, I get this error when I make the PUT request to set up Sippy:

```

{"success":false,"errors":[{"code":10063,"message":"Invalid upstream credentials"}],"messages":[],"result":null}

```

I'm using AWS credentials with read and list permissions for my bucket and R2 credentials with read and write permissions. Were you able to get past this?

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Haven't run into it but I did find that 10063 might correspond to a filename that's too long: https://cdn.nsoftware.com/help/BA6/cpp/S3Errors.htm

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