IF ISNOTBLANK Expression

I have 4 columns for photos, and I want photo2 to show if photo1 ISNOTBLANK (i.e. a photo1 has been taken).However, for photo3 and photo4 it's working well but on photo2 I am getting an error message "This entry is invalid", yet photo1 has a picture input.  Any help

 

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In column [IMAGE_2] go to Show If and this function

ISNOTBLANK( [IMAGE_1] )

Solved, had a valid if expression that was not being satisfied in photo2

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