attaching files and removing them

1. Do I have to save the file in drop box into the idoceo folder before i can attach or can it just bein my drop box?
2. How do I remove a file I attached, i could not work it out. While I was playing around i accidently attached filed that were actually my idoceo backup files.

Hi there,
I think I replied already on a private message in detail, but just in case and not to leave the post unanswered...

1. Yes, it has to be stored in App/iDoceo but important improvements are coming in iDoceo 3.0
2. Slide your finger from right to left and you'll see the 'Delete' option