1. First download a viewing software, a CAD mini viewing app, as shown in the following figure:
2. Find your CAD file and open it (for example, it was received by WeChat), as shown below:
3. When this page appears, click other applications to open it, as shown in the following figure:
4. Select the CAD thumbnail and click Always, as shown in the figure below:
5. You can open the graph for viewing, as shown in the figure below: