I have seen a couple of mentions about shooting in portrait mode on the mini 3 when it comes out.
I would assume that this will be like the 16:9 mode on the mini2 and just cut down on the amount if available resolution by just zooming/cropping the picture.
You can easily take very high resolution portrait images on you mini 2 buy just taking a verical panorama and stiching it together in post.
Most of my recent pictures are HDR photos of about 6 to 9 images merged together and that way i get higher resolution pictures with very little cropping.
Most of my photos go on social media and I actually like the way portrait pictures look on walls over landscape.
I hope this helps someone and if you want a demo im sure i can make some kind of video on the subject.
I do the same All of my portrait mode images on Instagram are vertical panos stitched in Lightroom. As @Gavinnewcombe says, it creates higher resolution images.
Just take 3 separate photos yourself, keeping the drone still tilt the camera up or down overlapping each frame by about 25%. Lightroom Classic stitches them togther fine, not sure about the app as I’ve nver used it.