Some settings such as the file uploads, date picker, and other settings are not able to be previewed inside the Divi Visual Builder. This is due to the unique nature of this plugin and the limited ability to customize the core Divi Builder. Since this is like a “hack” of the current module, Divi is not currently able to render the settings. The custom settings provided by our plugin will take effect when you exit the Visual Builder and view the form. As soon as any solution becomes available within Divi to create a visual preview, trust me, we will add it! We are excited about this plugin and wanted to release it and hope in the future the time comes when we can make a visual preview of some of these custom settings.
Until then, we can share a helpful recommendation. Try keeping two tabs open at the same time, one in the builder and the other out of the builder. Whenever you save changes in the one, you can immediately refresh the other tab to see the changes take effect.