@Phoenixx Hello, 

- Unfortunately, motion detected recordings and local continuous recordings are saved in the SD card, only the manually recorded clips or pictures are saved in Memory of the app. 

The recordings in Memory can be shared, downloaded or deleted on the Tapo app directly, however, the recordings saved in the SD card cannot be shared, downloaded or deleted directly from the Tapo app, users will need to put the SD card into a computer (with an SD card reader) or phone to check or delete the corresponding recordings. Thank you for your feedback, we will record and forwardyour suggestion to our team for further evaluation. 

-If you remove the SD card from camera and plug SD back in, Tapo camera will continue its recording rather than delete the old recording files. Only when SD card capacity is full, it will begin to overwrite the oldest footage.

Here is a FAQ explaining how to view record on PC which may help: 
https://www.tp-link.com/support/faq/2905/

-The Tapo camera supports the standard ONVIF protocol (Profile S), so it will work with NVR or NAS devices that support the standard ONVIF protocol as well.
If your NVR device support standard Onvif and it should work with tapo camera.