?Unsupported file types for sync

I have DEVONthink pro office running on 2 iMacs and I am trying to sync several databases between them using using SyncStores on an external drive. This seems to work OK apart from some file types- notably filemaker and iBank files, which don’t seem to get synced. The modification date within DTPO for these files does’t change even after editing in their respective applications, and when opened on the other mac the changes previously made are not present. However, the changes seem to sync across OK using GoodSync! Am I doing something wrong with the sync process in DTPO?? Grateful for any advice/assistance…