Documents defined as Letters, which must physically reside on the application server, should be stored in a place where they will not be overwritten by a MoversSuite process. In general, the \\[Server Name]\mssShare folder will not be overwritten and is considered a safe place to put custom documents, however, the name of any custom file should not be the same as any standard MoversSuite file; the MoversSuite installation process will overwrite any file that is of the same name as the file it is attempting to place on the system.
Suggested format for custom physical documents:
\\[Server Name]\mssShare\mssLetters\Custom\
Where [Server Name] represents the name of the server that hosts MoversSuite