Changing the Sprocket Toolbox

Hello everyone.
Out of curiosity, I tried to modify a sprocket taken from the Toolbox...
Everything is going well, except at the time of backup. When I click on the green validation checkmark, the sprocket disappears.
so I can't use " Save As "...
On the videos I see on Youtube, the modified sprocket behaves like any 3D part, and can be recorded.
Does anyone have the solution?

Thank you all and have a good weekend.