Kitkat 4.4.2 and Play music: won't find files I have a nexus 4 and I have been using the music downloader called music maniac. Just recently updated to kitkat 4.4.2 and now when I download music the play music app won't find it in my phone. I can find the file when I look it up in the storage settings, but when I plug it into my computer I look in the same place and it's not there. Anyway I don't know how to make it read the file I guess.
Try an Android media scanning process using apps such as 
SD Scanner (other older media scan apps seem to crash in 4.4). Once done, the new files should show up in Play Music (I personally found Android's background running of the scanning process to be too slow).

It could be due to the .nomedia file (see "Hiding your files from the Media Scanner" on the Android API guide) in the folder containing the files (or even in a parent folder) which prevents the any media from appearing in Play Music. Since .nomedia is a dot file, it is considered a hidden file and your file explorer may not show it in by default and you may have to dig into the settings. OI File Manager has an option to view hidden files.

With regards to not being able to see the files on the computer. Strangely on OSX 


using the Android File Transfer app that is provided by Google, the MusicManic folder /sdcard/MusicManic appears as a file and not a folder
using adb shell, it appears as a folder

using AirDroid on my Nexus 4, my computer can connect to the phone and /sdcard/MusicManic appears as a folder which can be downloaded.



So I guess for now, try use AirDroid to transfer the files across.