-I browse for an attachment during editing this post and choose "open"
-choose "preview post"
-and "remove attachment"
Instead of removing the attachment the software then tells me that the post has been edited and the attachment is then available for download. Also one of my files (it is *.fla) is not accepted ("the document contains no data") and I can't find a reason. I will have to check the file, though. Perhaps I'm missing something...