You said "I'm trying to put in MP4s" - so you're talking about MP4 VIDEO files instead of actual MP3 AUDIO files. Is that correct?
MP4 files are video and not audio/music files, so they won't appear under the "music" section of your player.
Plus, a Rockchip chipset player will not play MP4 files, only converted ones to .AVI with specific height x width resolution.
What screen size is your player?
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