Yes, Nokia 7.1 does have OTG support.
The Nokia 7.1 has Qualcomm Adreno 509 GPU.
Yes, you can record 4K videos with Nokia 7.1 at 30fps.
Nokia 7.1 comes with 3060 mAh Li-Polymer non-removable battery. Ideally, this is sufficient for the moderate usage of the phone to last for a day. The phone supports quick-charging as well.
Nokia has quietly released one of the most exciting inexpensive phones of the year in the Nokia 7.1, a well-designed phone that delivers first-rate performance.
With the Nokia 7.1, the brand continues its run of impressive mid-range phones carrying close-to-stock Android. While the phone has weaknesses, overall it offers better quality and features than you would expect at this price.