I get 360 degree panoramic photos that look nice and they are all just under 5,000 pixels wide and about 2MB png files. I saw a video about how to get the high resolution jpg pano file and althought I did get a jpg pano it was still only about 2MB. How can you get a high resolution pano from the Mini 2?

You can turn on raw images and then stitch them yourself.     there is a guide someone put together on the forum.