Could you please email us a few screenshots showing how you configured the camera? In particular, we'd like to see the screeshots showing your upload frequency / interval.
In our setup guide page for Amcrest cameras, you can setup a longer interval, but if your camera model does not support it, there is not much the server can do. Please note CameraFTP server cannot control / configure your camera; it does not and cannot connect to your camera. (Your camera connects to our server).
To solve the problem, please check if they have a newer (or older?) version firmware.
If you have a spare PC, you can use CameraFTP VSS software connecting to the camera. CameraFTP VSS can display live camera video on your PC screen and upload footage to the cloud.