I uploaded some photos on the computer but they are no longer on my camera
Did you use a Casio program or just an explorer?
If you used the -let`s say- Windows Explorer- then it is strange this happened, unless, you pressed and held the "shift" key down whilst dragging the photos onto your computer.
To get them back onto your camera, you need to:
a) locate the place your camera stores the photos and go into that directory (ie wiht the MS explorerer)
b) open another MS explorer window and locate the photos on your computer
c) select all photos you want to go back onto your camera
d) left click and hold the this button on one of the selected photos
e) drag them onto the Explorer window showing the directory of the camera
f) release the left mouse button
Now you should have them back
Greetings from Germany