Talix73 said

When i transferring an email to another folder no longer shows the attached files. When i try open attached file (pdf) i see error (attach picture). When i delete this email, in trash I again can see attached files.

re :When i transferring an email to another folder

I'm presuming you are talking about an imap mail account. Please let me know if using pop.

Are you talking about transfering from one imap folder eg: Inbox to another imap folder? OR transfering from imap folder to another folder in 'Local Folders' mail account?

In Account Settings > Synchronisation & Storage Do you use the option to 'keep messages for this account on this computer' ? click on 'Advanced' button Are both of those folders in the list and are they selected?

Yes, everything is as you wrote, but the problem was solved by itself. I did not do anything. Perhaps some bug. Thanks!