Nokia 6.1 Plus does support NFC(Near Field Communication) to share content with other NFC enabled devices but not wireless charging.
You can see detailed specs here: Nokia 6.1 Plus
Watch the review here:
Yes, Nokia 6.1 Plus supports OTG. USB OTG or USB On-The-Go is one of the most recent technologies that allows you to connect your pen drives and in some cases hard disks to your smartphones and tablets. It has a cable and through that cable, you can directly view and use your pen drive in your smartphones.
You can find the specs of Nokia 6.1 Plus here: Nokia 6.1Plus
The Nokia 6.1 Plus comes with the Android One Custom UI and the Stock Android does not have any screen recording feature.
But you can install any third-party app for this feature and that would work for you fine as well.
Check Full Device Specifications Nokia 6.1 Plus
Yes,Nokia 6.1 Plus supports VoLTE in both the SIM slots since VoLTE works on bands 3,5 and 40 and both the SIM slots in Nokia 6.1 Plus supports band 3 and 40. You can use two Jio SIMs at a time in Nokia 6.1 Plus.
Specs : Nokia 6.1 Plus
Nokia 6.1 Plus support the slow-motion at 480p at 120fps. The slow-motion videos taken by the phone is not that much clear, it could have been better.
You can check this video:
You can check this link for product specification: Nokia 6.1