You haven't provided us with enough information to actually assist you.
Such as including your configuration information for the plugin or osT. Please help us to help you by reading and following the posting
guidelines located in this thread: Please read before requesting assistance. The more information you give us the better we will be able to assist you. Thank you.Did you change the storage backend in Admin Panel > Settings > Attachments?Did you enable the plugin after you installed and configured it?Did you ensure that the permissions on your newly made attachments folder are sufficient for the webserver to write to the it?Are you seeing any error messages in your php error log?