Microsoft Teams has had the ability to blur your background for a while, but they just expanded this to allow the use of a background image instead of just the blur effect. Out of the box, you’re only allowed to choose from a selection of Microsoft-provided images, but support for custom images is there–you just have to know where to drop your images.
So, here it is. Copy your images to the following directory, and they’ll show up in Microsoft Teams when you enable background effects:
Backgrounds\Uploads path doesn’t exist on your computer, it might be because you haven’t used the background effects feature yet. Turn on your camera, pick a background image, and the folder should get created. Or just go create it yourself.
Microsoft’s images use 1920×1080, so I recommend following suit for best results.