Question:

I'm using the yaromat check form extension and when I add Pure PHP upload, it checks the form but if there's an error, I can see it but the pure PHP upload makes still the insert and even if I didn't choose a file to upload (and disable the "File required")... any idea what to do or what I'm doing wrong?
Answer:
You need to put the upload javascript on top of behaviors list instead of the check form javascript. To do so:

Select the <form> tag

Go to the Behaviors pallete

Make sure that the Pure Upload javascript is on top of the behaviors

And that the Check Form behaviors is below - if not correct with the arrows

NOTE: This is valid if you use Yaromat Check Form or the standard Check Form behavior.