I think I got it covered, neodeist. Looking at your file I noticed the following: First of all, you need to place the placeholders on the page itself. The caption align feature didn't work for you because you didn't enter any text on them (in other words: w/o text, no caption panel).
I redid your file a bit and attached it to this post.
LATER EDIT: As sledger pointed out, these tweaks missed the <head> name and therefore didn't work off the page. New .zip file will be uploaded...
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