Summary: SFTP must be used to upload large files. When using SFTP for the first time it is necessary to create a new SFTP account: (https://developer.amazon.com/ftp/account.html). Existing SFTP login information can be viewed using the same link. The password for the SFTP account will not be visible again on this page so it will need to be stored elsewhere. If necessary the account password can be reset from the same page as well. Allow 30 minutes before attempting to login to the SFTP server following a password reset.
All assets uploaded through SFTP must follow specific naming conventions or else they will not be properly recognized on the server. Exact naming convention standards can be found here: https://developer.amazon.com/ftp/ftp_naming_convention.html.
Further detailed instructions on the SFTP upload process can be found here: https://developer.amazon.com/public/community/post/Tx30OJ8QYIJ3G5G/How-To-Upload-Files-to-Your-Distribution-Portal-Account-via-FTP.
Keywords: SFTP, upload, assets