Custom Item Icon not appearing on Smart Map or Map

I am trying to change the icon of the item in the smart map and the map but the icon are not appearing when i drag and drop this item on the smart map and the map knowing that i am using the sensorMonitor sample in milestone mipsdk-samples-plugin. I have tried different Icon format (ico,png,jpg) and it is still not showing it. Please check the pictures attached.

Does the unmodified sensor monitor plugin sample work?

When I use the sample I can open Resources Designer, then I can see the icons are really 6 BMPs, all of them different sizes, I believe you must have the same and cannot skip any of the sizes.

Thank you for your answer, Yes in the plugin sample work, the icon used does appear so we tried icon with the same resolution but it didnt work that’s why we opened post. So we will test with .ico

file that includes all 6 BMP sizes.