Dropbox is an unencrypted cloud solution. Once it is on the Dropbox severs then any of the Dropbox staff/could/ read it. Or it could be copied or otherwise lost by people who aren't your employees. Or it could be leaked as party of a wider Dropbox hack/leak. Or it could be retrieved by a foreign government (USA, I think) without your knowledge. Generally, it is out of your corporate network perimeter and hence out of your control. In general, that is*not* a good thing.
I haven't used Dropbox, but I have created an encrypted folder on Google Drive. I imagine the same would work with Dropbox.
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