ImageRenderer not support loading external image file

Hi~
Currently, I try to display uploaded Image on Grid column.
However, I found ImageRenderer can only support ExternalResource and ThemeResource

I try to extend the ThemeResource to load Image file from folder outside the VAADIN/ path, even path is generated, but Image still cannot display at all.

I also copy the image URL path from display page source, still cannot display.

Anyone know what could be issue ?