MERGED QUESTION
Question from zetvet : "copied files from PC to SD, disappeared on SD"
When copy mp3 files from PC to SD card (with card reader), in some moment they are disappeared from folder (example Music), shows folder is empty, but in the same time storage space been used. And, if trying to play on phone (Android 6.0), (tablet WIN 10) , they're not playing, just first song playing, but shows more. I'm just tried to copy songs in different ways. Full folder, also shows PC copying to SD, but when open folder (SD), it's empty. Confused! Thank you.