Copying files to android calls lav splitter. What for?

Question

Android

When copying files from a PC to an Android phone, a LAV Splitter pops up - just video and audio. 10 files - 10 sets of splitters... Which side is this? How is this related? And if there are no codecs, it will not be possible to copy at all? Yes, just copy, don't convert. Like a flash. Yes, the file size is the same. Yes, it's media. (avi or mkv or mp4). No, moving does not cause. No, it does not call back (from phone to PC). Explain, who knows - faced?