Our office had a long journey with experiments on devices for Project Sharing.... and hope our joinery can help you guys to decide the best method/hardware to go with.   Like Tom, we also started with Google Drive, and when that didn’t work, we experimented with Drop Box.    After we spoke to tech support and understood l permission requests works between the Working File and Project File, we understood that such cloud server setup is an impossibility. So we dropped Dropbox.
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