I have custom button that runs some javascript code, I added it to page layout in Salesforce classic. But when I switch to lightning, on record page my button is missing. I tried creating custom lightning page, but I can only add lightning components to it. How can I add a button to standard lightning layout?
I have built a button that redirects to another web application using some values from current record and I need this button to be on record page layout, but in lightning too.