If you are unable to take photos in your Sera Tech App, this is usually an issue with the general Settings on your iPad.
From the Settings app, find the Sera Tech option. Clicking on the Sera Tech option and look for Camera. This will be a toggle that will need to show green.
Note: if you don't see the Camera option at all within your Settings, navigate back to your Sera Tech App and select the Take Photo button from your Photos and Documents area. This should provide a pop-up for selection on how you would like to share the camera with the Sera Tech App.