Hello, I am trying to add a new button above the product tree view, right after the create and import buttons. I tried following these steps: https://www.odoo.com/pt_BR/forum/help-1/question/add-custom-button-to-list-view-header-90255, but wasn't successful.
I have no clue of how I will actually call the action I want, but so far I can't even get the button to show up. can someone point out what I am missing? What I have so far is a view with the following lines: