I'm currently trying to index a file, that sits outside of EPiServer following the example below. The object is index and i can see it in Find 'Overview'. However the SearchAttachmentText$$string field is missing and i can see the Attachment$$attachment. This leads me to the impression that Find isn't recorgnising the Attachment property. Not sure what is happening, however i need support to get his working.
http://world.episerver.com/documentation/Items/Developers-Guide/EPiServer-Find/9/DotNET-Client-API/File-attachments/