e-Learning
Looping object effects

Hello!
I have a background image of a timer that has reached zero.
I would like this to flash between being there and not (as if it’s reached zero and is now flashing as an alert)
I’ve got a shape set to the same colour as the background placed over the timer and have applied a flicker effect.
Is there a way to loop an effect, or another way to achieve what i’m after? Capturing it as a video would be great, but isn’t an option in this case unfortunately.
Thanks in advance!
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