There's no Regenerate button, because the same photo in the same studio always comes out the same. To get a different result, change what goes in: the studio, the photo or the plate setting.
To try a different studio
- Change your active studio under Studios. See Choose a background.
- Create the advert again with the same photos. See Create an advert.
That's a new advert, so each photo uses one image from your monthly allowance.
If an advert didn't finish
Open it and select Try again. A retry doesn't use any of your monthly images. If a photo couldn't be read at all, the screen says so: upload a different photo instead.
If only the plate is wrong
Change that photo's Plate cover under Image settings. The photo is made again without using any of your monthly images. See Cover or show the licence plate on one photo.
If a photo still doesn't look right
Retake it with Photo requirements for a good source image in mind, or see My image doesn't look right — what to do.
In the Motuva app
The steps above work there too.