How can I save every tab?

when a click "next" to another tab the information about page1 isn't saved in google spreadsheet. if my client don't finish all tabs, i haven't any information. i just wanna save all tab information when he clicks "next"

I'm sorry, the next buttons or tabs does NOT submit the form. They simply navigate your users to different pages. Your users need to click the "Submit" button for the submission to actually be saved in our servers, which should reflect in your Google Spreadsheet.

Let us know if you need more information on this.