Uploads a profile banner on behalf of the authenticating user. For best results, upload an <5MB image that is exactly 1252px by 626px. Images will be resized for a number of display options. Users with an uploaded profile banner will have a profile_banner_url node in their Users objects. More information about sizing variations can be found in User Profile Images and Banners and GET users/profile_banner. Profile banner images are processed asynchronously. The profile_banner_url and its variant sizes will not necessary be available directly after upload. Note: If providing any one of the height, width, offset_left, or offset_top parameters, you must provide all of the sizing parameters.