We have EE 2.5.3 with MSM 2.1.4. I am entering content via the default_site and displaying the information on a second site. All of the data fields display on the second site EXCEPT any files that I uploaded via the default_site. For example, in the code below, all of the school fields are displaying properly, but the SCHOOL_THUMBNAIL, which is an uploaded image, is NOT displaying, and there is a thumbnail uploaded that is showing on the default_site. The code below also knows that there is a school_thumbnail, because it gets inside the conditional, it just doesn’t display it.
{exp:channel:entries channel="schools" site="default_site" limit="1"}
{if school_thumbnail}
{school_thumbnail}
{/if}
<h1 class="entry-title bottom">{title}</h1>
<h2 class="entry-subtitle bottom">{school_city}, {if school_state}{school_state}, {/if}{school_country}</h2>
....etc…