When you attach a file, roundcube tells you: File upload failed
When you fixed all what you think and even fullfilled some php vars like base_dir and pack of upload* variables and you still see empty files and you wanna remove this #$%^!, just relax and..
In a config file keep/add in active plugins filesystem_attachments
and remove database_attachments
(if you had it).
They can't work together and attachements needs at least a filesystem_attachments
.
And all will work like a charm :)