Add a trigger to disable the Next button when the timeline starts.
Add a trigger to enable the Next button when the media completes.
Note: Those simple triggers will work. However, they'll also disable Next if the user returns to the slide. To prevent that, it's best to track completion with a variable.
Create a T/F variable with the initial value of False.
For the trigger that disables Next, add a condition so it only does that when the variable = False.
Add a new trigger that adjusts the variable to True when the media completes.
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Note: Those simple triggers will work. However, they'll also disable Next if the user returns to the slide. To prevent that, it's best to track completion with a variable.