Hi, first of all thank you for this great software!
I noticed that the way EXIF rotations are handled is not perfect.
I created a gallery with the files from https://github.com/recurser/exif-orientation-examples.
Regarding the thumbnails (tested in Firefox and Chromium):
- on my installation (2017.09.25), the number 1,3,6,8 are correctly rotated
- on demo.filerun.co (2017.09.25), they are all correctly rotated
However, when I open them for a preview, only the number 1 (without rotation) is correctly displayed (on demo and on my installation).
I digged further, and I think that demo.filerun.co correctly rotates the previews because it uses the ImageMagick "convert" binary.
See https://stackoverflow.com/questions/20600800/js-client-side-exif-orientation-rotate-and-mirror-jpeg-images for possible solutions.
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