Looking at version 16, if you go to Setup in the "Save As" PDF, you have an option "Workspaces to export". If you select "All", all your Paperspace pages will be saved; unfortunately, so will a copy of the current view of Modelspace.
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John R.
V17—V21, 2015—2019
Designer, Deluxe, (Professional, Expert, Basic), Platinum
RedSDK enabled
Windows 10 Pro (1903), 64-bit