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Sometimes when inserting a photo, they flip from vertical to horizontal as in this thread: https://www.britishcarforum.com/bcf/showthread.php?117722-Cigar-Lighter Any way to fix that?
Are the pictures in question taken with an iPhone? If so, the only solution I've found is to open it on your computer first, then slightly "crop" the image and save the result. I don't know why, but iPhone pictures seem to want to flip 90 deg when uploaded. If it's not an iPhone picture, well, try the same thing - crop the image slightly then re-upload.
Regarding the iPhone, Iβve had success rotating the pics 90 deg; saving them; then rotating them back 90 degrees to the correct orientation before posting them. Crazy!
Android phone here (Pixel 3, and LG before that). Posted photos have always been upside down until edited.