appear and dissapear fields
It will be good to have the form where you can configure appearing and dissapearing fileds. For example : we have to types of customers one of them want dilivery and the others not. People who need dilivery click on checkbox(need dilivery) and address fill appear. People who don't need dilivery will not click checkbox thererfore they will not see these fields. It will be really good )

Actually i think this is already done =). Please check the tutorial ‘Show/hide fields depending on a condition’ : http://smartforms.rednao.com/tutorials
Is this what you were looking for?
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djmikeproduction commented
Hello, Edgar!
I'm having an issue with SF. I have a form that all the fields work except upload a file. When I used that field on the form, it gives an error message that reads An error occurred, please try again later. Please help!
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Vladislav commented
Many thanks for your fast reply.
I actually have another problem, and can't solve it.
I have written a question here.
Calculated information is not displayed in the massege.https://wordpress.org/support/topic/calculated-fields-doesnt-print-in-e-mails?replies=3\
Thanks a lot for you work !