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It probably respects the embedded orientation data in the file. To test, can you do a screen shot of an image that uploads upside down and see if the screenshot uploads normally? If so, you can search for a tool that will strip EXIF data from the file and that should stop the flipping.
Took a road trip to Yokohama the other day (so technically not taken today, but I was on the road at the time). 806 km in three days, Lady Mary purring along in her element. Here she is outside the historic Mampei Hotel in the resort town of Karuizawa.
I'll write up a fuller report of the road trip, with more photos, once I've sorted them out.