const path = path = wx.env.USER_DATA_PATH + '/pic.png';

wx.getFileSystemManager().writeFile({
  filePath: path,
  success: () => {
    wx.saveImageToPhotosAlbum({
      filePath: path,
      success:()=>{},
      fail: (err) => {}  // 提示 saveImageToPhotosAlbum fail Error Domain，PHPhotos Error Domain Code 3302 \"(null)\"
    })
})

saveImageToPhotosAlbum 保存图片到相册失败

机型 iOS

系统 15.1.1

微信：8.0.20