When you are looking at the web browser on your phone.... the delay can be set for 0 - 60 seconds. Be sure to start the audio (click the play button on the player). If you set the delay to 20 seconds, you will need to wait 20 seconds to see how your setting has affected the sync. Depending on your browser etc. you may have to refresh the page and re-start the audio each time you change that setting. Then wait for the audio to start to see if it is in sync.
On my phone, 4 seconds works perfectly, and on a remote computer, it sometimes requires as much as 26 - 27 seconds.... depending on the ISP, OS, and browser used.
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View attachment 88713