I created a ContentType (named Trainer) using the interface and used a media picker field to input the trainer's photo besides a text field for trainer's current position and 2 parts(Title and Body) to define other info.
When browse the trainers and go to the details of the trainer the photo appears at the end of all other fields and I cannot find howto use placement.info to have the photo be displayed on top of all the fields and other parts.
These are the default rules in Orchard.MediaLibrary:
<Match DisplayType="Detail">
<Place Fields_MediaLibraryPicker="Content:after"/>
</Match>
<Match DisplayType="Summary">
<Place Fields_MediaLibraryPicker_Summary="-"/>
</Match>
<Match DisplayType="SummaryAdmin">
<Place Fields_MediaLibraryPicker_SummaryAdmin="Content:after"/>
</Match>
So in your case it would be:
<Match ContentType="Trainer">
<Place Fields_MediaLibraryPicker="Content:before" />
</Match>
Or, when you might add multiple medialibrarypicker fields in the trainer content type:
<Match ContentType="Trainer">
<!-- Photo is the name of your field in this case -->
<Place Fields_MediaLibraryPicker-Photo="Content:before" />
</Match>
Enable the shape tracing module to easily find out how to target the field:
http://docs.orchardproject.net/Documentation/Customizing-Orchard-using-Designer-Helper-Tools
http://docs.orchardproject.net/Documentation/Understanding-placement-info