Ok, I figured out how to do this. And its waaaaay unintuitive. How I got it to work = Step 1: download all music files you want as possible notifications in .mp3 form to your downloads folder (should be the default location) Step 2: Go to the Samsung App "My Files" (on my phone it is a yellow icon with white folder). Step 3: Click on "Internal Storage" option on My Files main page. Step 4: Click on "Download" folder where your files should be. Step 5: Click and Hold the file you want as Notification sound, after a moment the app will show grey circles a with checkmarks in the files you select. Once you select all the files you want at notification sounds, click "Copy" at bottom of screen. Step 6: Click the text at top of screen that says "> Internal Storage" , this takes you back to folder list. Then click on "Notifications" folder and click "Copy Here" on bottom right of screen. (I don't know why this Copy Here text is greyed out when accessing this from Notifications app, but here it was not greyed out for me and it copied) Step 7: Go to the "Settings" app from your main screen all apps list. Click "Notifications" . My phone showed a list of Recently sent apps, just below that list you need to click "See All" . This gives you a list of all apps that will use Notifications. Step 8: Pick the one you want (lets say "Messages" for this example) and click its name. This brings up that apps notification options. Click on what is usually titled "General Notifications" label and it will bring up a menu that has one option as "Sound". Click the "Sound" option and you will get the list of default notification sounds with your sounds in the list in alphabetical order. That's It! You can repeat the process for Ringtones as well.
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