Sent mail attachments missing

[Georgijus Korobkovas]

I have question about sent emails attachments , I was scrolling 
yesterday through older sent emails and want to see files attached to it 
and don't see any files when open email . In roundcube it shows icon 
that there is attachment but when open email don't see any attachment . 
The only emails that are sent to local users have attachments but 
outside of organizations all of them missing attachments . How I can 
setup so all sent emails have attachments attached ? Thank you
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