Hi @meikaj310, thanks for posting today!
It sounds like you're referring to online-only storage with Smart Sync. If you're files are online-only, and then you downgrade to a Dropbox Basic plan, your files would remain online-only until you next access them.
They'll then download as local, and won't have an option to go back to online-only.
Hope this helps to clarify matters!
Jay
Community Moderator @ Dropbox
dropbox.com/support
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