Thank you for posting.
The file paths used by the container field generally need to be local paths. One exception is on windows when accessing a remote file share:
If using Mac, it is possible to mount a remote file share so that it can be accessed with local file paths.
In a mixed environment it is possible to include both file paths in the container field reference.
This solution does require filesharing on the server, moderate scripting, and some configuration on the clients so you may want to consider other options. What sort of workflow are you looking for as an end result?