I need to send documents signed in pdf - they have extension .p7s
But when I add them to a new message, Send button is not active.
If I add another usual (not signed) file to this message, Send button becomes active, but when I send this message, recipient gets only usual files (files with extension .p7s are not delivered).
Please help me to figure out.
Is it possible to send such files with extension .p7s?