A health insurance company released an updated version of its customer app. The update includes a feature which scans a pharmacy bill and sends it directly to the health insurance company for payment. However, when the customers installed the update, they found that the camera couldn't be invoked to scan the bills. This bug was reported and fixed. Now new tests need to be prepared and executed, and retesting needs to be performed.
Which of the following tests will you execute as the MOST IMPORTANT test in the given scenario?