Hi All, 

I'm kind of new to lightning so bear with me...I had a custom button in Classic titled 'Attach Quote' that ran on java script. The button's functionality was to upload pdfs, and once completed would change the stage of a quote to Completed. This no longer works in lightning obviously and the only way to make it work would be to turn it into a lightning component and enable my domain. Since we are not ready to do that, does anyone have experience with creating custom buttons in lightning? I've never done one before so I'm not sure how to get started if this is a new action or new button. Any help that could be provided would be so appreciated . Thanks!