After using my S8 for a few months, I had only 2 GB remaining out of the 64. After several fruitless discussions with support, I was stumped. They couldn't help me to find the "missing " storage of 42 GB. They just wanted me to buy additional storage. Turned out there was a podcast app that had saved every single episode, whether or not I had deleted them. The usage did not show up as part of the app, but appeared as "other" when looking for storage. After deleting the app and reinstalling it, the storage reappeared. I guess any time you have an app that downloads a lot of data, be suspicious if your usage starts climbing. Good luck out there.
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