=Sheet2!G60 (Enter) Box appears "Update Values"

G

Gatsby

I want a cell in sheet 3 to update when I input data into cell G60 in sheet 2.
In the cell in sheet 3 I've typed : =Sheet2!G60
When I press enter, a box appears, "Update Values Sheet 2."I then have to go
to where I have the worksheet saved.
Why does it not just update without the need for all this?

Gatsby (Not the Great)
 
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