Css sprites icons provided by mosh. some of them do not display

I need help. My sprite components do not show up. I can only see the #wordpress sprite logo but the rest like #snap #chevron and quotes cannot display. What might be the problem ??? I have been following the course all along

I think there is a problem with the file itself, when it was created!
You will notice that he mentioned a problem with the logo icon, I guess it extended to other files as well. For learning purpose, disregards these icons problems!

I found for the chevron for example, the only way I could get it to work was by copying the svg code directly into the html, even as a separate file outside the sprite it wouldn’t display or function properly.