i'm getting closer, this is the css i'm looking for

<div id="attachment_preview_nfa-feed1" class="newsfeed-attachment-preview ow_smallmargin item_loaded" style="height:45px

i want to change the 45px to 100%

it's on line 2114 of ow_static/plugins/base/js/OW.js

this.showLoader = function(){
        $previewCont.show();
        $previewCont.empty().addClass('attachment_preloader').animate({height:45});
    }

I tried changing it to 100% and it broke it....i changed it to auto and it broke it, i changed it to 100 and the div height changed to 100px......if i can just get it to do the 100% it would be perfect.

change the 45 to 250 and it works like a charm except in internet explorer the video covers the embed add button....so now i have to figure that one out

fixed it....go to ow.css in the ow_static/plugins/base/css/ and add z-index: 1 to line 96 or to this line

 .floatbox_body {
    overflow-y: auto;
}

that fixes it