Boxifiler can't synced any files

Hello, I just have a problem. when I put the file saved to the two level directory in the external drive , Dropbox can not synchronize this file, but if the file saved to the first level directory, Dropbox can synchronize files .and if you saved file to the local disk with syce by boxifier, No matter how deep the file path, can be synced . so ,what is matter? and how to solve this problem?
thanks very much.

You can contact Boxifier support and they can help with investigating this.