Multiple photos

As I can get all the photos taken with the ActivityStarter component and using the android.media.action.still_image_camera action.

I mean, the camera is operated well and I can take several photos at a time but when I return to the app, I do not get the images taken, instead of receiving in the component [after activity] rather the component is operated by the component [canceled activity] of the component ActivityStarter

you might want to try a camera extension, for example App Inventor Extensions: Camera | Pura Vida Apps
Taifun