First up, to revert a doc you need to be on the online version of Dropbox.

To do that, login here: https://www.dropbox.com/home

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Once you're in, navigate to the folder where your document is saved.

Before you do anything, copy the current version of the doc + save it with a slightly different name just so you can refer to it if needed.

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Then, you can either right click on the document, or click the 3 dots on the right hand side of the doc (while hovering it).

Then click on: More > Version History > select the version you want to restore + click "Restore".

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Once the file is restored, you can open it in Dropbox normally. Depending on the nature of what was lost, you can either delete the copy, or go into the restored version + copy what you need to paste in the duplicate version.

If you have any Q's, grab Taren!