One of the more annoying and obscure features vB had which annoyed my users for a while until I could work it out was the deletion of unused attachments.
This, in principal, is a great idea but it often takes longer than an hour (gasp!) to write a post. If this was the case then it would make the post but with a link to an invalid attachment. Due to frustration the user normally just left it like that....
Des XF have the same thing and if so, where can I turn it off / set it to a longer period.