I would like to save and reload the sh3d file by saving the file with the click of a button.

The latest version of 3djs online is running on my own server (https://megveszlak.hu/alaprajz-tervezo)

When starts the program, I want to offer a list from which to choose whether to load an empty sh3d or a previously saved one.

Similar to the free online of sweethome (after logging in).

Thanks, Gábor