I have July 2018 Patch on my phone with Oreo 8.0.1.
Seems there is a problem with WiFi Direct
Both in Sending and Receiving.
During Receiving after pairing and connection , the sender get transfer fail error.
During Sending / Sharing a pic or file there is no option of Sending via WiFi Direct, only whatsapp , bluetooth, etc are available.
I contacted Nokia chat they said a 3rd party app is necessary. But i can see samsung users are using it without third party app.
Seems there is a bug or feature problem.
Nokia please solve or embed it so that we can use it without 3rd party app.