I have also had this problem! I've just spent hours adding sheets to 3 separate excel documents, and saving all along the way very carefully. Dropbox has had a green tick on the syncing the whole time. I closed it when I was done and went back to open one to reference it, and every additional sheet to the first original sheet IS GONE!!! There are no temp files, no files in the cache, no previous versions. Where are my sheets?!
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