Android application package, version 1.0.03, with a Chinese file name that appears to refer to a live-streaming app. It is 17.4 MB in APK format. It is not repair documentation, firmware or a schematic, and nothing in the name ties it to any board or device model. An APK is installed on Android devices or unpacked with archive tools to inspect its contents. Treat software from unknown sources with caution, and scan it before installing on any working device.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @tv_software. Enginerys does not host this file.