Camera not showing video

I set up two spotlight cams over the weekend and one appears to be faulty. I set it up and connected it but tried to view the live view so we could see where to place it. Took ages with multiple installs and reinstalls for it finally to work (had to reset the wifi in the end). The camera is now in place and was working fine. However, now although motion is being detected all videos are blank (no sound, no video at all) and live view will not activate. I have reset wifi again (this camera is closest to the wifi) with no success. Camera is showing online and health report detects no faults Battery is fully charged Wifi is connected Motion alerts are turned on Ring plan is in place Motion zones were added for the relevant area. Another question too... With these cameras and cameras I have at another address, I appear to be having a lot of issues picking up important motion. I've set up motion zones and set sensitivity to max. They pick up all cars going past (even though motion zone is not active in that area) but do not pick people up going to the front door. Post man and other delivery drivers have managed to approach the front door and leave with no detection at all. It also picked my parents up leaving their house this morning but didn't pick up either of them coming home