Most likely your Action Group (AG) is not bound to a valid material group, the action units' seq frame ranges do not match the target part's available states, or no AG/event is placed on the AC timeline.
多半是动作组（AG）没有绑定有效的素材组，动作单元的 seq 帧范围与目标部件的可用状态不符，或 AC 时间轴上没有放置 AG/事件。
1. Open the AG panel and confirm a material group is bound. If empty, bind one.
1. 打开 AG 面板，确认已绑定素材组。为空则先绑定。
2. Check each action unit: target part = join must exist in that SG; seq ranges (e.g. 01:0-5) must fall inside the part's numbered states.
2. 检查每个动作单元：目标部件（join）必须存在于该 SG；seq 范围（如 01:0-5）必须落在该部件的编号状态内。
3. Use "auto-suggest sequence" to regenerate a seq matching the target part's states.
3. 使用"自动建议序列"重新生成与目标部件状态匹配的 seq。
4. Open CANVAS to preview. The canvas loads only scene + action-referenced frames; if the frame is missing, the part won't move.
4. 打开 CANVAS 预览。画布只加载场景和动作引用的帧；帧缺失则部件不动。
5. Open AC Scheduler and confirm the action is placed on the L1 role track within the L4 audio timing.
5. 打开 AC 调度器，确认动作已放在 L1 角色轨道上，并与 L4 音频时间对齐。
6. If the action depends on an event, open EVT and confirm the event is created and chained in AC as an AC+MUS pair.
6. 若动作依赖事件，打开 EVT 确认事件已创建，并在 AC 中以 AC+MUS 对链式触发。
7. Read the red validation hints beside each input; fix required fields.
7. 查看每个输入旁的红色校验提示，补齐必填项。
8. Run whole-project validation and click each error in the list to jump to it.
8. 执行整项目校验，点击错误列表逐条跳转修复。
Try the 3SAX V3 creator tool and run validation before every render.
现在就用 3SAX V3 创作工具试试，每次渲染前先跑一遍校验。