I'm trying to load files to work on while I'm offsite without PDM access, so I'm trying to use "work offline".  While I'm 'online', I can click on the Assy that I want to work on, and Get Latest, and then Check Out.  I then click on 'Work Offline', and the Assy is available, but when I open it, it is an empty assembly with all of its sub components grayed out.  When I hover over subassys within SolidWorks, I get the message "Cannot locate the file for the component to complete the operation".

This is confirmed when I navigate with Windows Explorer to my PDM Vault, and the only file visible is the top level assy, as well as a handful of other part files that I have checked out.  My understanding was that offline mode was supposed to pull all checked out assemblies, and their sub components, and then I'd have read-only access to the sub-components.  So, is PDM acting correctly?  Do I have to check out every subassy and part individually (this is a vehicle ~8k parts)?  And if that's the case, is there a 'check all' option when I open the assembly in SW, so that I don't have to click 'check out' on all 8000 parts?

Thanks in advance!  This is all on PDM Standard 2016 (build 16?), and SolidWorks Premium x64, SP3