Uploads a file that can be attached to a ticket comment. It doesn't attach the file to the comment. For details and examples, see [Attaching ticket comments with the API](/documentation/ticketing/using-the-zendesk-api/adding-ticket-attachments-with-the-api). The endpoint has a required `filename` query parameter. The parameter specifies what the file will be named when attached to the ticket comment (to give the agent more context about the file). The parameter does not specify the file on the local system to be uploaded. While the two names can be different, their file extensions must be the same. If they don't match, the agent's browser or file reader could give an error when attempting to open the attachment. The `Content-Type` header must contain a recognized MIME type that correctly describes the type of the uploaded file. Failing to send a recognized, correct type may cause undesired behavior. For examp