update paper link

README.md

@@ -2,7 +2,7 @@
 
 <div align="left">
 
-[![Paper](https://img.shields.io/badge/Paper-PDF-EA1B22?style=for-the-badge&logo=adobeacrobatreader&logoColor=fff)](https://x2-robot.feishu.cn/file/FurYbuThcofkOqxrsy7cnzUbndd)
+[![Paper](https://img.shields.io/badge/Paper-PDF-EA1B22?style=for-the-badge&logo=adobeacrobatreader&logoColor=fff)](https://x2robot.cn-wlcb.ufileos.com/wall_oss.pdf)
 [![Hugging Face](https://img.shields.io/badge/Hugging%20Face-x--square--robot-FFB000?style=for-the-badge&logo=huggingface&logoColor=000)](https://huggingface.co/x-square-robot)
 [![GitHub](https://img.shields.io/badge/GitHub-181717?style=for-the-badge&logo=github&logoColor=fff)](https://github.com/X-Square-Robot/wall-x)
 [![Project Page](https://img.shields.io/badge/Project-1E90FF?style=for-the-badge&logo=google-chrome&logoColor=fff)](https://x2robot.com/en/research/68bc2cde8497d7f238dde690)
@@ -161,7 +161,7 @@ If you find WALL-OSS models useful, please cite:
   title        = {WALL-OSS: Igniting VLMs toward the Embodied Space},
   author       = {X Square Robot},
   year         = {2025},
-  howpublished = {\url{https://x2-robot.feishu.cn/file/FurYbuThcofkOqxrsy7cnzUbndd}},
+  howpublished = {\url{https://x2robot.cn-wlcb.ufileos.com/wall_oss.pdf}},
   note         = {White paper}
 }
 ```