Emails filed to a network location can remain as pending if:

•    Location path is set to drive letter, e.g. J:\ 
•    slow connection to the server
•    large amount of emails in network folder.
 

Try one or more of the following workarounds:
 

UNC path
If locations are shown as drive letter, change to UNC path as follows:
1.    Ensure the drive is mapped 
2.    Highlight one or more locations and then choose Edit Path drop down, on the Locations ribbon, and change to UNC (as highlighted below) 
 

Check connection to Arup network
 

Ensure you are connected to the Arup network (or via AnyConnect) and then check the following:
1.    In File Explorer browse to the network location. When the folder is fully loaded then try filing again. If necessary cancel all filing and file again as described below:
2.    Go to Status | Filing Activity and change the drop-down on the menu bar from 'Show:All' to 'Show:Error and Pending'
3.    Select the email or Ctrl+click to select more than one email (or Shift click)
4.    Click 'Cancel' from the menu bar
5.    If the email didn't file then it will go back to the Inbox, or wherever it was requested to file from, with [Filing Cancelled] on the subject line
6.    Try filing again
 

Create sub folders 
 

If there are a large amount of emails in network folder create sub-folders to divide emails (e.g. into years) and new sub folder to file new emails into. Then create new locations or amend existing locations to point to new sub folders