In Gmail, it normally is only possible to upload pictures or videos as attachments. With Gmail Attachment Manager, it is possible to upload any file as an attachment to your mail (in any mail client).
Installing Gmail Attachment Manager will act as a plugin in your e-mail application in order to make it possible to upload any file as an attachment. It will not create a homescreen icon and thus will save up precious application space.
Gmail Attachment Manager is used by pressing the Attach Picture or Attach Video option in Gmail, and then selecting Gmail Attachment Manager.
Gmail Attachment Manager works with any email client or application that allows you to attach/upload things.
Note: will not work with .zip files, as these are blocked by google.