Mail to File: Attachment is not getting picked

Dears,

I have configured a Mail to File Scenario: Where PI will read email and pick the first attachment (.PDF File) and place it on File Server, however some times it is not picking the attachment and not placing it on File server.

Case1: In this case, it is working perfectly... the PDF file 145-2015.pdf is placing on file server

Case2: In this case, the attachment is not placing on File server. DECORP F221.pdf file not placing on File server

Your help need to solve this issue...

Thanks-
Rams