@koradiyashivangi If the camera app is reopening immediately after you close it, you might be calling the NativeCamera functions inside an Update loop that gets executed every frame. The restart issue is probably related to RAM usage; old devices that have insufficient RAM may run out of memory when the camera app is opened and in this case, Android OS automatically kills Unity app to free up some memory. Hence why the app restarts after the camera is closed. You shouldn’t worry about it much since the majority of the Android users have powerful enough devices and won’t be affected by this issue.
@stefanocavalli NativeCamera won’t save the image/video to Gallery automatically, the file will be stored at Application.temporaryCachePath. If you want to save the image/video to Gallery afterwards, you can give NativeGallery a shot: Native Gallery for Android & iOS [Open Source]