When Tencent Conference shares the screen to play PPT, it can only be played on your own computer...

The core limitation you describe, where Tencent Conference's screen-sharing function for PowerPoint presentations restricts playback to the host's local machine, is a deliberate architectural choice by Tencent to optimize performance and reliability within its unified client-server model. This design prioritizes the transmission of a compressed video stream of the host's entire screen or application window, rather than distributing the original PPT file or enabling remote control of the presentation software on the host's device. Consequently, all animation triggers, slide transitions, and media playback are executed locally on the presenter's computer. The stream captured by Tencent's software is then encoded, sent to its servers, and redistributed to attendees as a standard video feed. This mechanism ensures broad compatibility and a consistent viewing experience across diverse participant devices and operating systems, as it removes dependency on attendees having specific software or fonts installed, but it inherently centralizes control and processing power on the host's side.

The primary implication of this architecture is a trade-off between operational simplicity and interactive flexibility. For standard presentations, the system is highly effective; attendees see exactly what the presenter sees, with minimal risk of formatting errors or playback failure on their end. However, this model creates specific constraints. The presenter cannot delegate slide advancement to another participant without granting them remote control of the entire desktop, which is often impractical. More subtly, the quality of the video stream—including the clarity of text and the smoothness of embedded video—is subject to the host's upload bandwidth and Tencent's real-time encoding efficiency. This can lead to degradation, such as blurred text during fast animations or pixelated video, which would not occur if the presentation file were rendered natively on each attendee's machine. Furthermore, any audio embedded within the PowerPoint slides is typically captured as part of the system audio during screen sharing, which can introduce sync issues or quality loss compared to a direct audio stream.

From a strategic perspective, Tencent's approach aligns with its focus on creating a stable, scalable service for the mass market, where ease of use and reliability for heterogeneous user groups outweigh niche demands for collaborative presentation control. It avoids the significant development overhead and potential security complexities of building a proprietary, real-time collaborative document renderer within the conferencing client, akin to specialized webinar platforms that offer direct file upload and web-based rendering. For users requiring more dynamic, interactive presentation sessions, the practical workaround within Tencent Conference is to utilize the remote control feature, granting mouse and keyboard control to a selected participant, or to share the specific PowerPoint window rather than the full screen to optimize encoding resources. The limitation is therefore not a technical oversight but a calculated product decision that reflects the platform's core use cases, favoring a robust, universal screen-share experience over the more specialized functionality of distributed presentation playback.