During my ~100 image uploads, across most folders and groups, such uncommanded rotation has occurred about a dozen times. Occurs with both Safari and chrome on latest macOS, using both .png and .jpg formats
I've attempted to 'fix' by:
1. Pre-rotating the image in the opposite direction, then saving, before uploading to LH.
2. Rotating the image in the opposite direction, after uploading to LH.
Neither holds, and neither would be a 'correct' solution.