Access a variable in widget blueprint made in actor blueprint

I am trying to display different mesh depending on user input from combobox. Assign product asset function in side BP_placeable actor sets the mesh , I made a variable new mesh in bp_placeable and trying to set it from bp_startMenu widget blueprint .
since I am begineer I have trying to change different things in demo projects, have been stuck on it for a while. Dont even the the proper way to debug the issue. If i set a defaul value for new mesh that one will display but the value does not change depending on combobox input.

this is from the unreal handheld AR demo. the default app runs on my phone ,

you need to call the function “AssignProductAsset” in your widget after the set mesh.