I am working on an attachment problem. If there are some attachments in
email, then pop up a window before i send it. Then i can check the
attachments list. and preview the text by double click the name of the
attachment.

if I modify the attachment, in fact it modified a temp file. Then i try to
delete the original attachment and add the temp file as attachment again, so
that the modified attachment can be sent.

but, i have a problem. when i debugging the project, it works all right. The
attachment which have been modified has been sent. If i check it for two
times, that is double click the attachment for two times and preview it for
two times, then it works all right, the modified one is sent. but, if i click
the attachment for one time, then modify it, save it, and send the email, the
modified one is not sent.

i don't know why.

Any help will be appreciated.