Formatting Background Video Codec

I have attempted several times to upload a stock video that I purchased to my page's background. I keep getting the error message "The file codec is not supported. Video codec must be H264, MPEG4, HEVC or ProRes." 

I have googled the solution and even thought I changed the video codec to Apple ProRes by using my Mac's built in encoding (via Finder options). However, I am still getting the same error code.

I'd really love to be able to use the video because I love it and because I purchased it. Any help would be amazing! Thanks, all.