Access the cam admin interface. Go to Advanced > Video, there is "Time Stamp&On-Screen Display (OSD)" option, enable it. https://www.tp-link.com/en/faq-817.html

The cam may be dead if it doesn't respond to reset. Did you upgrade the firmware or something? Or it just suddenly blink red?

Screenshots stored in sd card? You need to access the admin interface of the camera from a computer, then download the files from sd card section to your computer

Does the tplink support fix the problems? Would you like to share the update?

Make sure the cam has solid green light. Otherwise change cable, check your router. And verify the wireless network your phone is on. Another way to set up is to use the camera's IP address (can be...

Did you set it to Auto mode? If you select Night mode, do you hear the click sound of switching from Day to Night mode? What's the color of light sensor?