Put your logo on the wall and the license plate

On a car, tap Add your logo at the start of the backdrops. Upload your logo if you haven't yet (a see-through PNG looks best), pick a studio, showroom or building, and tap Put my logo on it. In about 20 seconds you get your own copy of that backdrop with your logo on the wall as a real sign. It's made once and kept with your backdrops under Yours, so every photo you make on it shows the same sign.

Making one is free, up to a monthly limit shown in the window. A new one of the same backdrop replaces the old one, and removing one doesn't change photos already made on it. Scenic backdrops have no wall, so they can't take a logo.

Interior photos of a car on your logo backdrop show that same room through the windows, with your sign where a window looks toward it, as if the car were parked in your showroom. On any other backdrop, interiors get a clean, bright studio through the windows. It costs no extra credits.

Under the backdrop, switch on Your logo on the license plate. Your logo covers the plate on every outside photo of that car, the ones already made and the ones to come, and your next cars start with it on. Switch it off to get the plates back as they were. It's free and uses no credits.

Photos where no plate shows stay as they are. If a plate is missed, switch it off and on again, or use an edit ("hide the license plate") on that photo.

Upload a new logo in Settings or in the logo window. Logo backdrops you already made keep the logo they were made with: make them again for the new one. New photos get the new logo on their plates; switch a car's plate off and on to update the photos it has.