If a latecomer joins the imam while he is standing in prayer, does he begin with the opening supplication or recite al-Fatihah?

The questioner : If the follower joins and the imam has already begun the loud prayer?

The Shaykh : What does he recite?

The questioner : What does he begin with if the prayer is silent?

The Shaykh : If it is a prayer?

The questioner : Not a loud prayer, not a loud prayer.

The Shaykh : We said: A certain amount of independent legal reasoning is necessary, and I will take this opportunity... The door of independent legal reasoning is open even for the common people, even for those who cannot read or write. A person cannot live without opening the door of independent legal reasoning, but each has his own domain.
Now, here, when I say independent legal reasoning is necessary, for example, there is a difference between a follower who joins behind the imam immediately after the imam's opening takbir and a person who joins after a period of time has passed, and so on. The scenarios multiply here greatly, and there is no need to expand on giving examples and mentioning them.
Now, here, we say: He exercises independent legal reasoning. If he is convinced that he can combine the opening supplication with the recitation of al-Fatihah, he combines them. No, he does not recite the opening supplication and recite al-Fatihah, because the ruling on al-Fatihah is stronger than the ruling on reciting the opening supplication.

The questioner : If he entered without knowing when the imam started, and he recited al-Fatihah, and the imam bowed, and he estimated that he might not be able to finish al-Fatihah before the imam stands up, he cuts it off.
Another questioner: May Allah reward you with good.

The questioner : If he misjudged in the opposite direction, meaning he recited al-Fatihah.

The Shaykh : He makes up for the opening supplication without reciting a surah.