In SharePoint Designer i've made a change to seattle.master. I made sure to hit save, and then on Look&Feel i selected Specify a master page (Seattle) and i reset to all subsites.
When i saved it I can see the change if i'm logged in (Site Content link is hidden) but it didn't work for any other users who go to the url. Is there something else I need to do? This is my first experience with master pages. Thanks