Missing file in material POP-UP

[PeterSwift]

When I render on the render server it often tells me that a file is missing. a PNG file, I guess inside one of the materials. I'm just wondering how I find what material it is affecting?
This is just something small that's a bit annoying but it probably more common with medium size companies that share materials when this can happen.

My wish is just that you add text in the POP-UP what material it is affecting so it will always be super fast to fix it!

Thanks and keep up the good work