How do I get a list of mp3 files and play them?

[Taifun]

There are several errors in your blocks

1. you forgot the else part

If api version <= 33
Then ask for read external storage permission 
Else ask for read media audio permission

2. get the file list after you got permission... currently you ask for permission and immediately try to get the list, this will not work
   I e. Moce that block into the button click event

3. rename your variable newSound to listSounds

4. learn to work with lists, there is no need to use those replace all text blocks

Imagnity.com List Tutorial, Mirrored - @Saj

(copied from imagnity.com, courtesy of @Saj) List Blocks On App Inventor by Sajal Dutta | app-inventor, tutorials | 102 comments List is a necessity in almost every app regardless of what programming language you use. This is the easiest way to create and manipulate a set of values/items/elements in an ordered fashion. Please go over the reference before we start. In this tutorial, we will learn how to create a list, add new items to a list, display list items, replace an item in the list, rem…

5. if you only want to display the filename in the label, check again my jukebox example to find out how to do it

6. the source property of the player expects the complete path to the sound file, see again the jukebox example

Taifun