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Level 6

In one of my forms I used similar concept, however I used Button and Image overlay on each other and have code under Button Click event....But the code attaches any document/file the user chose attach rather than just screenshot....this could be starting point for you to try some thing you want.... Following is the code I used....

var aInstance = this.parent.index; //this is the table row instance in your case

var selectFileName = "ScreenShot" + aInstance; //this is to assign a relative name for each image they like to upload

var doc = event.target;

doc.importDataObject(selectFileName); //opens the dialog box for user to navigate and select any file to attach

var MyPar1 = doc.getDataObject(selectFileName);

var filename = MyPar1.path; //get the file path in to a variable so you can extract the name of the file they select and determine type of the file and do some exception coding.

Good luck,