Sync external OneDrive shared folders

Going offline for field work and coming back to sync makes complete sense, especially if versioning is enabled to prevent any accidental overwrites / data loss.

I'd be remiss if I didn't point out some key factors for our Access experience:  First, it's not being "hosted" on SharePoint- it's only stored there.  Second, we're a small team (less than 15), and generally it's only in use by 1-2 users.  Finally, I've automated the import function so those users aren't making any design changes, just running reports or queries.  If it was larger scale or if there was a larger user population, I'd probably move it to a full-blown SQL instance.  :)  Regarding your comment on sync mechanisms, I think you're absolutely right.  You can open it through the SharePoint interface and it will work, but is locked as "read-only."  To get full permissions, you have to be able to sync the folder... which is what brought me here once my 6-month "systems break" started. 

I took a break from the Server admin field while I went to school- do you think there's anyway a federated or cross-domain trust could help with your issue?  Again, I haven't messed with that sort of thing since Server 2012, so I'm a bit behind the times.

Best,

Ben