Saved Form edit only blank columns

[comgen_technolo]

Hi, i have saved only 1 column of image, the rest image column didn't save. 

when editing adding the remaining images in columns, i can clear the "first" saved image and update, how to make the already filled images un editable in the same form?  @Aleksi 

while editing the same form again, already added should be uneditable.

[TeeSee1 · Accepted solution]

You can try entering the following in Editable if of each col

ISBLANK([_THIS])

[comgen_technolo]

Thank You very much, solved.