I've spent a very long time creating a powerpoint that is about 1Gb - but I have plenty of storage on my Dropbox account. It has been repeatedly deleted for some reason. Very much not by me, and no-one else has access to it or my account. Please please please tell me what on Earth is going on. I cannot afford to lose this piece of work and it is driving me nuts.
Here's a screen grab to show the activity on that file
I think there was a conflicted copy for some reason - I have had that very occasionally in the past but it's never deleted the updated version once, let alone repeatedly. I've deleted the conflict so hopefully that's the end of it