Michelle,
To begin with, you should post ArcGIS Viewer for Flex questions in the ArcGIS Viewer for Flex space in GeoNet, but don't worry about that we will get it moved.
The common problem many people have it that they do not use a actual URL in their hyperlink field, They assume that a physical path, like c:\blah blah\image.jpg or \\UNC Path\image.jpg is ok. You should always have an actual URL for your hyper-link.
I am not sure what
Also, All these pictures are saved as a raster in ArcMap? |
this means are you saying that your pictures are saved in a Raster column or as an attachment or what?