How to set custom thumbnails for C++ and Blueprint classes?

I want to change default thumb image for a C++ class in editor. If possible I want to modify BP thumb image too. What is the way I do it?

Thank you.

Any progress on this? I have a bunch of blueprint classes that I’d love to have custom Thumbnails. (Not the Captured from viewport though)

Yes, I solved it. :smiley:

Yo, do you mind providing the solution you came up with?