If you are monitoring from the cloud, simply add a rule.
Click on Settings->Firewall Rules.
Explanation:Camera
Protocol:UDP
Source address:manually selected -> Camera IP
Source Port:Empty
Target address:manually selected ->
Target Port:Empty
After saying save, you can test the rule. If you still do not have access, you may need to add the reverse of the same rule to the rule list.
For this;
Explanation:Camera 2
Protocol:UDP
Source address:manually selected -> Camera IP
Source Port:Empty
Target address:manually selected -> Any
Target Port:Empty
After saying save, restart the recorder and try to access it again.
If the camera(s) still do not work,Hotspot may be active. In Hotspot->Privilege menu you must add the IP of the camera to the privilege list.