Flipbook Material in UMG

Hi all,
I have made a simple Flipbook material I’d like to use like an UI animation in a widget BP.
The material is setted up with a “TIMER” node, but in this way, the animation doesn’t start from the 1st frame.
I can’t find anything on the web about this issue. Can someone has a solution? Or is there a better way to achieve this?
Thanks for your replies,