I would set a clear boundary.
If the coach wants clips for a particular reason, they can ask for them. Otherwise, parents sending individual footage plus their own analysis can create a lot of extra noise around one child’s game.
It can also put the coach in a difficult position if every family expects a response.
I would tell parents that useful observations are welcome through the normal feedback process, but the coach is not running a weekly video service from parent submissions.
If a clip captures something genuinely important, fine. It does not need commentary attached to it.
At U11, children already receive plenty of football information.
The adults should be careful that filming, reviewing and messaging do not make every match feel like evidence being collected.