If I join the prayer late while in the standing position and I start reciting Al Fatiha however don’t have enough time to finish and the imam goes into ruku. If I follow him into ruku without finishing reciting Al Fatiha is my salah still valid?

Ustadh AbdulAziz al-Haqqan

It is still valid, yes, and this is what you should do: you should follow the Imam if there is not enough time to finish the Fatiha.