I have a number of HP T5000 Linux Thin Clients, but cannot see USB memory sticks in an ICA session.
The same USB stick is visible in an ICA session from a PC.
'Connect Client Drives' is checked in AD.
'Use connection settings from user settings' is checked in TSCCon all servers.
In the Thin Client Settings (Settings>HP Desktop Options>USB Storage), 'Enable USB storage' is checked.
The USB device is visible in UNIX (ls /mnt/usb1)