@juanjullianf_twitter If you are importing media for objects, you should be able to use the objectRepresentationSplitter (& specifically the mediaPrefix parameter:
http://docs.collectiveaccess.org/wiki/Data_Importer#objectRepresentationSplitter) to import media from your directory. Depending on what you want to do
@sterlingjenson might be right and it could be easier to do media as a secondary import