It looks like you're searching for a very specific build of the Google Camera (GCam) mod. Based on the build number , this is a port created by the well-known modder Arnova8G2 , released around June 2020.
You can download this specific APK from reputable GCam hosting sites: Download GCam 200604 2138build 021 apk
: GCam ports are often hardware-specific. If this build crashes, you might need a specific Config XML file for your phone model, which can usually be found on the same download page. It looks like you're searching for a very
: This site hosts the exact 5.200604.2138build-7.3.021 version you mentioned. It requires Android 8.1+ and is designed for arm64-v8a devices. Download GCam 200604 2138build 021 apk