Timer registers to be updated simultaneously

Hi,

I am using STM32G474 with TIM1, TIM8 and TIM20 and working with STM32CubeIDE.

I want to updatethe ARR, CCR1, CCR2 and CCR3 regs at the same time. I taught that with the preload register it can be done but it doesn't work for me.

So how can I do to set the ARR, CCR1, CCR2 and CCR3 shadow registers and to make them be updated in a, lets say, overflow event of the CNT register?

Thanks!