To allow anonymous uploads on a ProFTPD server, you need to edit the config file.

1. Create an Upload folder in your root FTP directory. This is usually /ftp
2. Vi this file: /etc/proftpd.conf
3. Go to bottom of the config file and add the following within the <anonymous></anonymous> zone.

<Directory Upload>
<Limit STOR CWD>
AllowAll
</Limit>
<Limit READ RMD DELE MKD>
DenyAll
</Limit>
</Directory>

4. Save and close file. No reboots are required.