The Sample Service is an illustration of a back-end implementation, adopting the MVC pattern and more precisely ASP.NET MVC. You can use it as a guide on how the service should look but it may need to be adjusted for your server-side back-end programming language, especially if it does not rely on the MVC architecture.
The server-side implementation is in the hands of the developer and will vary depending on the requirements, but in general the Upload component sends a request similar to the one a regular input type="file" would, when used within a form.
Hope this answers your question and please contact us back in case there is something more you may need help with.
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