I don't know where the actual folder is but you should be able to add a ringtone by scrolling down to the bottom of the stock ringtones and tapping on Add ringtone. Here's an article about it including a video from State of Tech.
Sprint support has another guide which implies you definitely should be able to drop some sounds into the notification folder bet they must be a supported file type. Offhand I'd say you either need to be connected to your PC to find the folder or use a file explorer on your phone like say Solid Explorer to find the folder.
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