Sniffer Mode AP
To convert UDP traffic into client traffic you have to decode frames as PeekRemote. Another step has to be taken to decode the traffic now. Preferences > Protocol > IEEE 802.11 > Choose type and enter the ssid password.
WLC to FTP Server
To view client traffic again you will probably need to go to references > Protocol > IEEE 802.11 > Check Ignore the Protection bit Yes – without IV