Adding custom file do not works

[vanplesniak11]

Hi!
I prepared for myself new file, and I add it to the options

After closing modal via button "Close" or just "X" button, I see that I don't see available my config data.

Config data example:

 {
"Lorems": {
    "Latin": "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.",
    "Mixed charsets": "Lorem ipsum dolor sit amet, Римский император Константин I Великий, 北京位於華北平原的西北边缘",
    "Special characters": "Iąę!@#$%^&*())ßäö"
  }
}