How is “stand in” used?

In Signed, Sealed, Delivered: The Vows We Have Made (2021), one line is: “standing in the London Museum of Mail,”

Which movie is “stand in” from?

The clip at the top of this page is from Signed, Sealed, Delivered: The Vows We Have Made (2021).

standing in the London Museum of Mail,

8 作品で登場 · 1 本目

to block or hinder someone from doing something; to judge someone or pass judgment on them; to wait one's turn in a queue; to take sb's place

92 本の映画に登場

編集映画の 25%
to block or hinder someone from doing something
And I will let nothing stand in our way.
編集映画の 5%
to judge someone or pass judgment on them
編集映画の 5%
to wait one's turn in a queue
オックスフォード映画の 5%
to take sb's place

定義：Oxford Advanced Learner's Dictionary 第 9 版