The company has discontinued its business. Support is now provisionally running on another company for a year.
I recommend replacing everything. The new app only works halfway.
It can't work like that, the camera communicates with the mobile phone via WLAN, if the mobile phone is the hotspot, the WLAN is switched off as a receiver and cannot be recognised. I have it running via the home WLAN and it works. However, the app is disastrous, needs improvement....