Oppo R9S Plus Qi Wireless Charging:
Qi Wireless Charging not supported, but Accessories available.
Unfortunately, your Oppo R9S Plus doesn’t have Qi Wireless Charging integrated. Upcoming devices might support wireless charging as OPPO joined the WPC in 2019. However, you can use a Wireless Charging Adapter for your device to make it Qi compatible, or view the list of all Qi enabled phones.