我尝试着用官方说的getBackgroundAudioManager播放saveFile之后的音频文件，但是还是没法播放。有没有api，可以播放本地下载保存的音频？
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相关文档
- wx.getBackgroundAudioManager: Mini Program/Development/Extended/API/To be adapted API summary/wx.getBackgroundAudioManager
- wx.getBackgroundAudioManager#Note: Mini Program/Development/Extended/API/To be adapted API summary/wx.getBackgroundAudioManager
- wx.getBackgroundAudioManager#Return value: Mini Program/Development/Extended/API/To be adapted API summary/wx.getBackgroundAudioManager
- wx.getBackgroundAudioManager#sample code: Mini Program/Development/Extended/API/To be adapted API summary/wx.getBackgroundAudioManager
- wx.getBackgroundAudioManager: 小程序/开发/API/媒体/背景音频/wx.getBackgroundAudioManager