To Embed or De-embed, That is the question

I just received a file from a client that is to be used for a parallax BG. I opened it in photoshop and found that a blend mode was embedded in the file. I didn't worry about it and recreated the file without the blend embedded which was the problem for the client.

However, i would like to know how to embed that also and if there is a way to De-Embed the blend mode for future considerations.

So how are these things done?

I am adding this question on also but it's not the same topic.

How do i reset my color swatch to the default? (colors in the slide bar and saturation levels in the big square)