Changing the intention from the greeting of the mosque to a missed obligatory prayer

Question:
Honorable Shaykh, may Allah grant you success. A man entered the mosque and began the greeting of the mosque, then remembered during the greeting that he had not prayed a missed obligatory prayer. His question is: Can I change my intention and enter directly into the missed obligatory prayer?

Answer:
No, you do not switch from a voluntary prayer to an obligatory one during the prayer; this is not permissible and it does not suffice. However, if you switch from one voluntary prayer to another voluntary prayer, there is no harm, provided you switch to one of the same rank or lower; but to one of a higher rank, no. Yes. Complete the prayer you are in, since I am currently in a voluntary prayer, and then make up the missed obligatory prayer. Yes.