Image support limited to uploaded files for that node

Hello, the img_filter module illustrates what I'm looking for, I just can't figure out how to tell Texy to use the node's attached file information instead of going to a single upload folder. This helps me properly limit the user on what images can be included in their post (they have to upload them first)... Also to have it go by the user's chosen upload name instead of the file name. Is this possible?

It might be easy to modify img_filter, but its not clear to me from the Texy documentation how to make this work.

Thanks,
Kevin