Screen repair help: is the tinted "gel" behind the glass replaceable?

Hi,

I decided to attempt the supposedly impossible task of replacing the glass only on my Galaxy S6 Edge, and it looks like I only partially failed. By this I mean that I was able to separate what looks to me like like an important part of the display from the glass and what looks like a cheap piece of gel. My replacement glass includes only the glass and not the gel. I totally wrecked the gel while trying to remove it from the glass. So, my questions are these:

1. Is the gel, in fact, cheap and easily replaceable? Is it even important?

2. Is this just generic craft store gel? If not, what is it called? How can I get a replacement?

If I sound like a noob, it's because I am; this is my first real repair attempt. Thanks in advance for any help!

Picture!