This is the same question asked in github issue but non of the answers solved my problem.
The looping playlist function (with Previous/Next command) works fine with the original sample with two audio sources. But will fail if I add more audio source in `audioAssets.js`. The previous/next function will fail to access sources other than the first two.
I found that the item initialized in dynamodb always have playlist [0, 1], and manual edit doesn't work.