Installed after the installation guide. My external HDD is still discovered without UAS on my DS220+.

|__usb1 1d6b:0002:0404 09 2.00 480MBit/s 0mA 1IF (Linux 4.4.302+ xhci-hcd xHCI Host Controller 0000:00:15.0) hub
|__1-4 f400:f400:0100 00 2.00 480MBit/s 200mA 1IF (Synology DiskStation 7F00071E9481C644)
1-4:1.0 (IF) 08:06:50 2EPs () usb-storage host6 (synoboot)
|__usb2 1d6b:0003:0404 09 3.00 5000MBit/s 0mA 1IF (Linux 4.4.302+ xhci-hcd xHCI Host Controller 0000:00:15.0) hub
|__2-1 174c:55aa:0100 00 3.00 5000MBit/s 0mA 1IF (ASMT ASM1153e AAAABBBB01C0)
2-1:1.0 (IF) 08:06:50 2EPs () usb-storage host7 (usb1)

Did Synology change something after Update