Where can a supplier's file come from?

All of these are added in the workspace (Add a supplier):

• A link, including Google Sheets shared as "anyone with the link".
• Google Drive: a private sheet or file, through a Google account you connect once.
• Email: an attachment the supplier sends to your store's own MostStack address.
• FTP / FTPS / SFTP: a fixed file, or the newest file whose name matches a pattern.
• An API: the supplier's own API, with a key or login.
• Another Shopify store:
  • with an invite code, if that store uses MostStack;
  • through the store's own app, if it doesn't.
• An upload by hand.

Connections a supplier needs (a Google account, a server, an API key) can be made right there while adding it.