There is no official Samsung application by that exact name for general consumers. The term "Asistencia de Tiro" (Shot Assistance) is sometimes used in unofficial/moded camera apps for Samsung phones, often found on APK download sites. These files are not published by Samsung and can pose security risks (malware, spyware, or bricking your camera).
I understand you're looking for a guide regarding (Samsung Shot Assistance) APK. However, I need to provide a critical clarification first. asistencia de tiro samsung apk