Why is the slider not progressing with the sound?

Discuss
#1

Why is the slider not progressing with the sound?
Is there a mistake in the code ؟

mp3
mp31040×460 93.5 KB

#2

blocks (1)
blocks (1)1106×654 49.1 KB

test5.aia (550.8 КБ)

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How to make working music player with slider just from link?
#3