>>I actually observed this also for all threads. When you click View All button, only simple view is available. You can not answer to particular message in that view, you can not see attachment either. You have to view the individual message in order to be able to Reply or view Attachment.
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>This is not what we are talking about it. The thread is about the attachments not being shown. I replied to ask for thread ID because I cannot simulate that situation.
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>As for the concerns expressed in your message, this is the way it should be as the display of the entire thread is simply to generate something simple.

This is exactly what we're talking about. In the 'View All' view I never was able to see attachments before even if the particular message does have an attachment. I thought it's by Design.