Long-awaited for, we were all happy to see the custom background last week, and no longer the “blur background” which clearly showed that something was fishy behind you.
All is missing is an “upload” button to be able to add your own image, just like so many other web conferencing tools.
Here is where to upload it, just copy/paste this path to Windows Explorer and copy images here.
%APPDATA%\Microsoft\Teams\Backgrounds\Uploads
Thank you to REBEKAH CARTER
Source: Microsoft Teams Delivers Custom Backgrounds – UC Today