Adding a new cam--- previews on add cam screen but getting error

Hello. I am new to Angel Cam. I am set up on static IP and have tested my RTSP feed in VLC player with no issues. I am trying to add it to Angelcam. I click Add Camera, then H264 or MJPEG camera, of an unknown brand, then enter the RTSP address. I click Detect Camera and Angelcam successfull connects and shows me a preview of my live cam. I name the cam and click Confirm & Proceed. Then I am always getting the error: Something went wrong while you were trying to connect your camera to the cloud

Any ideas??? Thanks!!