The playback is very smooth. The only dissatisfaction is that it does not support seeing folder, because I am used to storing audio and video in folders, by language , singer, and genre, because sometimes I take the bus to church on Sundays. During fellowship or worship, I just want to enjoy pure poetry , or sometimes I just want to listen to the audio of a certain singer (because I am used sorting the album into folders based on the year of publication, so I can enjoy playing a certain singer in order from debut album to latest album) , appreciate the changes in tone and charm in songs by singers from teenagers to old age. If it does not support seeing folder, it will be too easy to cause confusion and does not suit my personality.