I'm trying to download my YT Playlist (157 songs) to a 256GB Flash Drive, and only 4 will play in my 2 USBs in my new Jeep Grand Cherokee HEMI V8. Most download on to the flash as *.opus; only 4 come thru8 as M4A or MP4. The 4 will play, and are the only ones to appear on the playlist. What format should I convert to? Is there fellow FReeper who's done this successfully. I used SaveFromNet.net and can't find any help thru Google, except Online VideoConverter, but keep getting an ERROR message. Is there a better video to...