Created attachment 127623 [details] File dialog doesn't show preview Check: 1. with "native file dialogs" (options) 2. restart 3. without "native file dialogs" (options) 4. restart Result: (see attach) Linux Mint 19.2 Cinnamon appimage
Sorry, no, this is not a bug. If you're using distribution packages, enable native file dialogs in Krita's settings; if you're using the appimage, native file dialogs cannot work because of missing platform plugins.