funkylogik
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Nicely explained man :thumbup:
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I, too, have the exact same issue. This has been going on for over 6 years... it's unbelievable that a techie hasn't posted a solution!!!I have the same problem with the Samsung S6 - downloaded for the first time today. As a workaround, I found that if I right click the thumbnail image on those affected (ie most of them in portrait mode) and convert to an Adobe pdf, which then opens the image, and then save as a jpeg the image, the rotation stays fixed in the thumbnail and on opening in all viewers. I will in future use the camera in landscape mode whenever possible.

I was having the same issue with my Galaxy S4 (Android 4.2.2). I cleared the camera cache and data, rebooted the phone, and now everything is back to normal.
This is for an S4. Your S6 may be slightly different:How do you clear JUST the camera cache? I dont see an option for that in settings, and Google doesnt seem to have any suggestions for clearing ONLY the camera cache.
This is for an S4. Your S6 may be slightly different:
Go to Settings>More>Application Manager
Scroll all the way to right to "ALL" then scroll down to the Camera app., and clear both the cache and the data.