I've made bunch of LUTs and wanted to try them in game but it seems no way to select custom png from overlay without restarting and changing default lut.png.
I just want to click browse in overlay, select another png and see the result. I want too much?
Is it really impossible?

Need to use the MultiLUT effect and pack your LUTs together in an atlas beforehand (see reshaed-shaders/Shaders/MultiLUT.fx and reshade-shaders/Textures/MultiLut_atlas1.png).