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Documents can be uploaded to the dash-board and viewed by anyone in the group the document has been assigned to. If your organisation contains multiple departments and sub-areas, you can share documents with all sub-groups which have been setup (eg. a document assigned to the 'Australian' head office can be shared to all states and cities which are setup as various sub-groups of the 'Australian' head office).
The permissions required to upload a new document to a group are the same as those required to add a new person into that group.