Extended Data - Text Message 1

Can someone explain to me what the Text Message 1 in Extended Data is used for?
I try to send a text string to Parameter m1, but I cannot find the text anywhere?

It is used in the Extended Data Alert custom email message.


The value passed as m1 in the API will be replace [m1] in the alert body as below -


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Hello! When I click EDIT the Edit Alert popup window is empty.

EDIT: When I first saved and then opened the Edit Alert again, it worked.