Receive file and other form data together in ASP.NET Core Web API (boundary based request parsing)

I had the similar issue and I solved the problem by using [FromForm] attribute and FileUploadModelView in the function as follow:

[HttpPost]
[Route("upload")]
public async Task<IActionResult> Upload([FromForm] FileUploadViewModel model, [FromForm] string member_code)
{
    var file = model.File;
    
    // ...
}