OpenAPI 3.0.1 upload/download file example

Do you have an example of what an ASP.Net Core 3.0 API operation that uploads and downloads a file and what the OpenAPI 3.0.1 yaml should look like in order to properly generate a client using NSwag code generator?

I've tried every combination I can think of, and nothing seems to work. Either I get errors trying to deserialize to a FileContent type, or I get errors about not finding the Content boundary or else the client has random parameters that aren't used or a myriad of other issues. At this point, my yaml is identical to what's on the OpenApi documentation page, but this doesn't work, either: https://swagger.io/docs/specification/describing-request-body/file-upload/ I just need a working example to go off of so I can stop guessing.