I remember I once saw something related to it on a blog, but didn't give much attention to it. I had made a note at that time which was:
Ctrol Shift E to preview layer
I'm not fully sure whether it was for solving this problem or not.
Anyway, let me explain what I need:
When I design something (there are a lot of layers), I have to make a lot of changes according to requirements from my directors. So every time, I have to go to export and preview it as web from there. Since the file is big, it takes a bit to open the output in browser. Then I copy the image from there (right click, copy. I guess it's OS feature) and send them to feedback.
I like copying the image because it works for me and it's easy then exporting it again and again, until it's ready for approval.
Another approach is, group all layers, duplicate it, press
Control + E (on Windows). It just rasterizes all. Then I can simply copy it. But at times it may be destructive (sometimes I lose my artwork, because by mistake I save the document without copying and directly merging it).
So is there any already existing feature in Photoshop it?