The documentation seems to be very specific that you have to use FTPDownload to retrieve multiple files with wildcard. FTPGetRawFile can only retrieve a single file at a time. So if you for some reason need to use FTPGetRawFile instead of FTPDownload you will have to make a loop in your load script to retrieve all the files.
Snippet from the documentation:
- FTPGetRawFile - Downloads a named file from your FTP server and returns the results directly. You can use the URL generated as a Web File source.
- FTPDownload - Downloads a named file, or files if you use a wildcard '*', from your FTP server to a local folder. The table returned shows the number of files downloaded.
You can read more here: FTP/SFTP ‒ Qlik Connectors