Yellow phlegm means that you are suffering from cold and flu or your upper respiratory tract is under the influence of some microbial infection. Dark yellow phlegm or thick yellow phlegm indicates an infection of lower respiratory tract or sinuses.
The new Media Transfer Protocol (MTP) enables you to manage content on any portable device with storage. 1  Details.
MTP works in a different way than USB mass storage devices. USB devices share their entire file directory, exposing even system files and important programs to the computer. MTP exposes only selected files to the computer, meaning that there is no way to alter the system files when in media programs like iTunes.