You can't. Because you want to share courseware at Tencent conference, you can only cast a screen, not just share courseware. Tencent Conference is an audio-video conference software under Tencent Cloud, which was launched at the end of February 20 19. It has the functions of online conference for 300 people, one-click access to the whole platform, intelligent noise reduction of audio and video, beauty, blurred background, locked conference, screen watermarking and so on. The software provides real-time screen sharing and supports online document collaboration.