Files were deleted from our account. Were we hacked?

[Mrs13]

Hello,
Last Thursday at 7:25 pm precisely, several dozen files were deleted from our dropbox, supposedly by a guest colleague, who of course didn't do it.
On Friday night, more files were moved into our dropbox at around 3 a.m., a time when none of our team was working. But we had already changed the password.
We were able to restore the deleted files, but how can we prevent this from happening again?

Thank you

[Rich]

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@Mrs13 wrote:

But we had already changed the password. We were able to restore the deleted files, but how can we prevent this from happening again?

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It's important to know that changing your Dropbox password doesn't prevent access for a device that's already linked to the account. It just prevents people from signing in on the website and linking new devices. If a device is already linked, the password is no longer needed for that device.

Review the linked devices and active sessions on your Security page. Remove any device or session that you don't recognize. You can also review your Events page and use the version history of a restored file to see what device an action took place on.