Resolve Google Picker not opening
What is Google Picker ?
Google Picker is a "File Open" dialog for the documents (Docs, Sheets, Forms, Slides etc) stored in Google Drive. It helps the user to search and choose a source document.
Problem: Google Picker is not opening
why is it happening
The Google Picker might not open because you have disabled / blocked the cookies option in you browser.
how to solve it
By Enabling the Cookies option above problem can be solve.
Solution - Step by Step instructions
Note: Steps below are illustrating the actions on Google Chrome browser. You can see similar thing in other browsers too.
Click on the 3 vertical dot button (top right corner of your browser) .
Now click on settings option from the menu
Enter content settings in search bar
Now scroll or find Content Settings and click
Click on Cookies
enable the cookies
That's It. Now refresh your browser and go to Form Builder add-on and continue your importing.