Upload large files to the OT2 Core Capture

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This question is in reference to the Opentext Core Capture API document.

When I try to upload a large file either as Binary or Base64, I get the following 413 error:

POST https://na-1-dev.api.opentext.com/capture/cp-rest/v2/session/files
{
    "fault": {
        "faultstring": "Body buffer overflow",
        "detail": {
            "errorcode": "protocol.http.TooBigBody"
        }
    }
}

The size of the file I used is 25874137 bytes.

Here is a screenshot for reference:

Please help with the steps to upload large files to the Capture Service. Thanks!