You can find the Apteryx address that Apteryx Online Capture is sending images to in C:\PlanetDDS\Apteryx Online Capture\appsettings.json. It will be formatted as follows:
The important bits are the ApteryxURL and the AETitle. Those tell you the Apteryx site that the images are forwarding to.
You can also navigate to C:\PlanetDDS\Apteryx Online Capture\AppCommonFiles\certs to find the cert that is installed into Apteryx Online Capture, which also will tell you which URL it is forwarding images too:
Changing the Apteryx Online Capture forwarding information is as easy as opening Apteryx Online Capture on another Apteryx site. Apteryx Online Capture automatically downloads and injects the cert associated with the Apteryx URL you’ve launched Apteryx Online Capture from for the first time, on first launch.
For example; if you download/install Apteryx Online Capture and launch it from the first time through customercare.Apteryx.net, Apteryx Online Capture will download the cert for customercare.Apteryx.net and forward images to it.
If you then navigate to ledapteryx.Apteryx.net and try to capture an image, the appsettings.json file automatically changes the ApteryxUrl, AETitle, and CertificatePath fields to match the ledapteryx information.