[XPOST] Scripted export fails with FMP 12 externally store container field

[Steve St-Laurent]

I'm running into a problem with scripted export of contents of a container field in FMP 12 where the store is externally hosted in the default external storage location.

Export works properly with a right-click export in the field but errs [unknown error: 20403] when I try to script the same thing.

It's not a paths issue because the script works perfectly when the storage is changed to internal. Any tricks or gotchas to this new external storage for containers?