Uploading to large directories / disable directory listing

I am having troubl uploading files to one particular ftp site.

The directory where i am putting the files has 50,000+ files in it and causes the remote server to close the connection whenever I do a directory listing. Unfortunately, whenever I do a CWD or click on that destination directory, SmartFTP (or the remote host. not sure) also initiates a directory listing (LS -al), which closes the host.

Is there a way to select a range of files on my computer and tell it to upload to that directory without causing a directory listing on the remote host?