Audio Files app accessible with VoiceOver with password protection
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Daughter of the stars
Thank you for the information. I will look on the App Store and see if I can find a iOS client, are there any other recommendations just in case I can’t find it? 
Snehashish Mahato
On Android, "Files by Google" likely provides a feature called "Safe folder" where one can keep all their files and folders protected. Now, I haven’t personally tested whether it uses the lock screen password or its own unique one. Even though this is quite Android-centric, I’m mentioning it just in case there is an iOS client available for it as well.