TOPIC: Preview button and documents question

I have been going through the tutorials, very helpful. But, they say that when you are done editing and stuff to click on the preview button to check what you did. My program does not have a preview button.  The only way I can confirm what I did is to generate a report.  Am I missing something?
Also, Can I add diagrams to the documents pages, I've been trying to do this and cant figure it out.  Thank you to anybody that can help.

Hi,

The preview button was merged with generate report to avoid confusion. All the tutorials are being redone right now. You can add a diagram via add photo screen or on the sketch section.