1、getImageInfo获取本地图片（uni.chooseImage选择图片）然后使用saveImageToPhotosAlbum再次保存正常，
2、getImageInfo获取网络图片得到的临时路径中无后缀名，然后哦使用saveImageToPhotosAlbum保存，返回saveImageToPhotosAlbum:ok；但是本地相册中不存在该图片；
返回结果：
'''
uni.getImageInfo：
{
"path": "file:///storage/emulated/0/Android/data/com.ahuoban.app/apps/UNI57D77B0/doc/uniapp_temp_1615252121182/download/1615252144446_74495492",
"width": 759,
"height": 441,
"orientation": "up",
"type": "jpeg",
"errMsg": "getImageInfo:ok"
}
uni.saveImageToPhotosAlbum
{
"file": "file:///storage/emulated/0/DCIM/Camera/1615252144446_74495492",
"errMsg": "saveImageToPhotosAlbum:ok"
}
'''
