Question of createing SPD file

Hello there,

I am trying RTP live stream, and follow the below article to set the configuration. When I finished creating stream files, it generated .stream file not .sdp file. How can I generate .sdp file? Or any document I’d better refer to?

Wowza version is 4.7.1.

https://www.wowza.com/docs/how-to-set-up-live-streaming-using-a-native-rtp-encoder-with-sdp-file

Thanks in advance,

Ying

PS: I am using manager UI to create stream file.