What's a good Android app for using a USB endoscope camera to look inside walls or pipes?

Camera endoscope / OTG USB is an application intended to function as a video viewer for USB OTG (On-The-Go) endoscope or borescope cameras. For users needing to perform visual inspections in confined spaces—such as checking for pipe blockages, inspecting wall cavities, or examining automotive components—this app aims to provide a direct feed from the camera's sensor to the phone screen. Its primary feature is straightforward: it attempts to establish a connection when a compatible USB endoscope is plugged into an Android device's port, displaying a real-time view. The interface typically includes basic controls for capturing photos or videos of the inspection. However, extensive user feedback highlights a significant limitation: the app appears to require a user rating before full functionality is unlocked, and even then, many reports indicate it fails to establish a stable connection with various hardware. This creates a frustrating loop where the core utility is inaccessible. For a successful inspection, the app relies heavily on specific device and camera compatibility, which isn't clearly documented. While the concept addresses a clear need for DIY mechanics or homeowners, the execution, as noted in numerous identical reviews citing installation and failure, seems unreliable. Potential users should be prepared for a trial-and-error process and may need to explore alternative apps if their specific hardware isn't supported.