Cloudflare R2 sync: Credential access key has length 40, should be 32

Hi,

I'm setting up S3 sync with Cloudflare R2. I created an API key, which is 40 characters in length.

When I try to sync I get this error:

InvalidArgument: Credential access key has length 40, should be 32 status code: 400, request id: , host id: (Provider: S3)

It looks like SiYuan expects a key length of 32 characters. But, Cloudflare does not give an option for API key length, it just uses a 40 character length.

Have I missed something?

Thanks,

Steve