Attachment over 20 MB and task management

Attachment over 20 MB and task management

Hi,
is there a way how to add attachment over 20 MB? I am using free mail without my own domain, and I can add attachments only up to 20 MB. I thought that as a free user, I can add attachments up to 25 MB(as the maximum size of mail should be 25 MB).Or that is just available for user with their own domain? Also what is the benefit of added "Task Management", that comes with premium mail plan?How exatly is that different from regular "Tasks" app, available for free user? Is there any more information about this feature?
Thanks in advance,
Matin Smitd