Go to Team View, then Documents.

Select the three-dot menu (•••) in the upper-right corner, then Create new document type.
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Give this document type a name, then Create.

Go to Team View, then Documents.

Select the three-dot menu (•••) in the upper-right corner, then Manage document types.
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Select the three-dot menu (•••) next to the document type you want to Rename or Delete.
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Go to Team View, then Documents.

Select the three-dot menu (•••) next to the document you want to move.

Select Move to type, then choose a new document type.
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