To activate this feature, check "Always Use Subtitles" in the Slide Show tab on the ribbon. Then, expand the "Subtitle ...

Open the PowerPoint file that contains the photo that you want to reference. Select the slide. Insert a text box. Click the "Insert" tab and find the "Text" area. Click the "Text Box" icon. Click ...

For now, the feature is available to Microsoft 365 Insiders, with it rolling out to more users soon, and PowerPoint for Windows users with a Copilot license. There are a few known issues ...