persistence not working

[Tatigo]

Both tested as instructed https://www.ventoy.net/en/plugin_persistence.html, not working...
elementary os 
MX OS

Need help if I made errors....




},

    "persistence": [
        {
            "image": "/ISO/2.elementaryos-5.1-stable.20200814.iso",
            "backend": "/persistence/Elem01.dat"
},
{
            "image": "/ISO/1.Parrot-home-4.10_amd64.iso",
            "backend": "/persistence/Parrot01.dat"
        },

        {
            "image": "/ISO/3.Manjaro-kde-20.1.1-201001-linux58.iso",
            "backend": "/persistence/Manj01.dat"
},

            {
            "image": "/ISO/1.MX-19.3_KDE_x64.iso",
            "backend": "/persistence/MX01.dat"         
        }
    ]