Step 1. Download and install https://www.getpaint.net/ you will need Developer Access or will need to contact IT to do this.
Step 2. Open your image and save it as .AVIF format.
Step 3. Use quality and compression speed to adjust size/quality. It will display the new size at the top of the image. (Under 10 mb is target)
Click Ok.
You now have your resized image.