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[maz]

Looks like it is actually possible.

Backblaze and ex_aws/ex_aws_s3 2.4.3 presign url issue

It works for me with the following config. I think you don’t have to specify the region: config :ex_aws, :s3, access_key_id: [""], secret_access_key: [""], host: "s3.eu-central-003.backblazeb2.com", bucket: ""

I got a presigned url from backblaze using above ex_aws_s3 config