updateExistingPivot how do you use it?

3-Way Pivot table: user_id, report_id, question_id

Need to update the user_ids related to a report. question_ids stay the same.

$users = User::find($ids);
$report = Report::with('user')->find($id);

Clearly, WHAT do i need to do. If i should use updateExistingPivot(), HOW??? Please no links to L docs they did not help. If you can just explain it simply and clearly, abs NO assumptions that would tremendously help!

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