To tell you the truth, I have never seen such a situation. It seems that we can only add them one by one. If it is a single, I personally suggest that you search the name of mv in Cool Dog first, and then click the last plus sign. To play, just click on the playlist on the leftmost side of the Cool Dog panel, and then right-click to refresh the MV of the list. There will be a TV pattern behind the song title. Click to start playing the corresponding MV of the song. If you want to download the mv, it will be buffered first and then downloaded. There is a subfolder called cache in the cool dog folder where you save songs, which is MV, but the MV you have played should be buffered.