If I rotate the image (I did it using preview on mac), then the bubble uploader does not change the orientation.
I did a bit of googling and it seems to do with the EXIF data on the image:
(This is data for the image that gets rotated - originally reported in the bug)
(This is data for the image after I rotate it 90 degrees clockwise in Preview on Mac)
I’ve seen images for other users rotated as well. So I believe this is a bug in the way the image compression logic handles the EXIF tag data. I believe it should be ignored.
For now I’m having the app email me every time a user uploads an image so I can check it and manually correct it if needed. Not great.