SaveUrlParams question for Office Integrator

I have the following setup for a CreateDocument call. Other than the content, the other parameters seem to be coming in as null. Is there something I am missing. My current code:

var documentId = Guid.NewGuid().ToString();

...

SaveUrlParams = new Dictionary<string, object>

{

{ "content", "$content" },

{ "fileId", documentId }

}

...

[HttpPost]

[Route("Save")]

public async Task Save(IFormFile content, string fileId)

Additionally, I have modified it a bit and then that results in a 415 being returned.

Alternatively, can an example be provided where a custom SaveUrl is used, and a custom parameter is passed pack in the SaveUrlParams, and what the Save API method looks like? The zoi-api-sdk Github examples are a bit lacking in this area.

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