Attachments are files that are attached to AODocs documents. Attachments are stored in Google Drive and are owned by the storage account of your library. Learn more: What are attachments?
To download attachments from AODocs documents:
1. Open a document in any type of library.
2. Open the More actions menu next to the attachment and select Download Attachment.
2. If the file is a non-Google file, the file downloads to your computer immediately.
3. If the file is a Google file (Docs, Sheets, Slides or Drawings), a pop-up opens. Select the format you want to download the file as. Press Download. The file downloads to your computer.