@Scorpius sorry if you don't have clue, you don't have to be rude, at least I am female. But it doesn't mean I am stupid to find out permission for directory. My Yappari worked fine until I manually deleted logs inside .yappari folder by mistake using FileBox. After I did what you said I've got logs back, but folder is empty all the time. It's obviously that my phone is missing something what keeps chat history, but I can't figure out what and that's why I asked. Maybe someone else could help. Thanks.