You have not provided the URL or the full HTML of the page. Tried to decipher the page from your screenshot. Have you made sure that the panels are open when you are trying to click the button? From the class name of the divs, it looks like you have to open some panels before you can see the button.

First, check if the element exists or not in the DOM from your code. Use the full CSS selector.

div#web-takeoff > div.web-takeoff__container > div.web-takeoff__page--panel-open > div.panel--open > div.panel__content--open > div.panel__documents > div.takeoff-control > button.bds-button.variant-primary``

If you see that the element exists. Then check if it is clickable or not.

If it exists, then it should be clickable using the script executor.

You have not provided the error. I'm assuming your selectors are not getting the button. So try again and see if you can get the button from your code.