Update FAQ documentation to include log collection and saving instructions

Author: obshenlanzhou

docs/en/source/camera_devices/8_FAQ/FAQ.md

@@ -25,11 +25,19 @@ If the camera node crashes unexpectedly, it will generate a crash log in the cur
 
 - To make this change permanent, check [this link](https://github.com/OpenKinect/libfreenect2/issues/807).
 
-### Additional Troubleshooting
+### How to Collect and Save Logs
 
-- If you encounter other issues, set the `log_level` parameter to `debug`. This will generate an SDK log file in the running directory: `Log/OrbbecSDK.log.txt`. Please provide this file to the support team for further assistance.
-- If firmware logs are required, set the `log_level` parameter to `debug` and set `enable_heartbeat` to `true` to activate this feature.
-- If you set the `log_level` parameter to `debug` and do not want the terminal to refresh too many logs, you can change `output="screen"` to `output="log"` in `launch`, and the logs will be saved in the `~/.ros/log` directory.
+1. **SDK debug logs**
+Set the launch parameter `log_level` to `debug`. After running, the SDK will generate log files in the `Log/` folder under the current project directory. If you want a more recognizable file name for this test, you can set the parameter `log_file_name`.
+
+> SDK logs are appended to the same file: multiple launches will continue writing into the same log file.
+> Recommendation: before packaging logs to send to technical support, delete old log files, then reproduce the issue and collect new logs. This keeps the logs cleaner and makes troubleshooting more accurate.
+
+2. **ROS 2 logs (`~/.ros/log`)**
+In the launch file, set the node (or composable node container) parameter `output` to `"log"` to save ROS 2 logs locally.
+
+> After setting `output="log"`, ROS 2 logs will be stored in the `~/.ros/log/` directory.
+> When submitting an issue, please package both the SDK logs under the `Log/` directory and the corresponding ROS 2 logs under `~/.ros/log/` for the same time period.
 
 ### Why Are There So Many Launch Files?
 

docs/zh/source/camera_devices/8_FAQ/FAQ.md

@@ -25,11 +25,19 @@
 
 - 要使此更改永久生效，请查看[此链接](https://github.com/OpenKinect/libfreenect2/issues/807)。
 
-### 其他故障排除
+### 如何采集和保存日志
 
-- 如果遇到其他问题，将 `log_level` 参数设置为 `debug`。这将在运行目录中生成SDK日志文件：`Log/OrbbecSDK.log.txt`。请将此文件提供给支持团队以获得进一步帮助。
-- 如果需要固件日志，将`log_level` 参数设置为 `debug`的同时，将 `enable_heartbeat` 设置为 `true` 以激活此功能。
-- 若将`log_level` 参数设置为 `debug`的同时，又不想终端刷新太多日志，可以在`launch`中将`output="screen"`改为`output="log"`，日志会被保存在`~/.ros/log`目录下。
+1. **SDK debug 日志**
+将 launch 参数 `log_level` 设为 `debug` 运行后，会在当前工程目录下的 `Log/` 文件夹中生成 SDK 日志文件。如果需要为本次测试指定一个更易识别的日志文件名，可以修改参数 `log_file_name`。
+
+> SDK 日志是追加写入的：多次启动会在同一个文件里不断累积日志。
+> 建议：在准备打包日志发给技术支持前，先删除旧的日志文件，然后重新复现问题并采集新的日志，这样日志更干净、定位更准确。
+
+2. **ROS2 日志（~/.ros/log）**
+在 launch 文件中，将节点（或可组合节点容器）的 `output` 参数设为 `"log"`，即可将 ROS2 日志保存到本地：
+
+> 设置为 `output="log"` 后，ROS2 日志将保存在 `~/.ros/log/` 目录下。
+> 如需提交问题，请同时打包 `Log/` 目录下的 SDK 日志和 `~/.ros/log/` 下对应时间的 ROS2 日志，一并提供。
 
 ### 为什么有这么多启动文件？