The Sync Tool keeps your strings up to date with a spreadsheet. It helps manage the localization process when working with translators or other developers. You are able to sync with
Sync with an Existing Excel File
Choose Existing Local File. Browse to the spreadsheet you would like to sync with, then click Sync. LE will remember the spreadsheet you have chosen to sync with.
Sync with a New Excel File
Choose New Local File. Enter the path of the new spreadsheet, then click Sync. LE will remember the spreadsheet you have chosen to sync with. This option exports your local languages to a spreadsheet and then finds differences between the two, which results in no differences being detected. This is used for the first time syncing if you have added strings and languages all within the LE Editor and want to create a master copy to sync with.