You may need to resize the picture to fill up the slide.
Select the picture you want, and then select Insert. Select the slide you want to add an animated background to, then go to Insert > Pictures, and choose either Photo Browser or Photo from File. Add motion to a still slide background image To get started creating an animated background, simply add a still image as your slide background, and then on the Picture Format tab, select Animate as Background. In PowerPoint 2019 for Mac or PowerPoint for Microsoft 365 for Mac, you can add visual interest to presentations with animated backgrounds for your slides. PowerPoint for Microsoft 365 for Mac PowerPoint 2021 for Mac PowerPoint 2019 for Mac PowerPoint 2016 for Mac More.
