How do I set notification (tone) from specific folder?

Question

Since the update a couple days ago, the Message+ directory won't let me choose which directory to add notification (tone) from. In the past I've been able to choose notifications that I have saved to a specific folder (i.e. audio, notifications, my notifications, but now that option seems to have disappeared.  How do I specify which folder to set the notification sound from?

gngracie · Accepted Answer

Thought I would post the fix I found in case anyone else has this problem...

I downloaded a file manager app (Amaze), and that solved the problem.  For some reason, "My Files" would not show the folder/files where the tones were located, even though I selected "show hidden files".  Once I downloaded Amaze, Messages+ let me choose Amaze as the default program to select tones from and I was finally able to navigate to the folder of my choice.