Scanning Over WAN/IPsec

Have an offsite scanner that needs to scan to a share. Scanner and its local machines are not within the AD of where the share is located.

From a network layout standpoint the two networks are connected via IPSec over WAN and are just on different subnets.

My two problems appear to be getting the share to accept and acknowledge the credentials the scanner is providing. I created a special account for this in AD and granted permissions accordingly.