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import RNFetchBlob from 'react-native-fetch-blob';
import RNFS from'react-native-fs';

  let dirs = RNFetchBlob.fs.dirs
  const file_path = dirs.DCIMDir + '/' + 'wechat.jpg';
  RNFS.copyFileAssets('wechat.jpg', file_path)
  .then(() => {
    RNFetchBlob.fs.scanFile([{ path: file_path }])
  })
  .catch((error) => console.log(error));