local file URL

[zoobibackups]

when I get the file from local to sign the pdf
file:///data/user/0/com.camscanner/files/react-native.pdf
this. error show
when I add this local file URL but they get error possible unhandled promise rejection Error sun.net.www.protocol.file.fileurlconnection cannot be cast to java.net.HttpURLConnection

and when I set this url = http://samples.leanpub.com/thereactnativebook-sample.pdf
this url working fine

[zoobibackups]

const {uri} = route.params;
const [filePath, setFilePath] = useState(uri);
const base64ToArrayBuffer = base64 => {
const binary_string = atob(base64);
const len = binary_string.length;
const bytes = new Uint8Array(len);
for (let i = 0; i < len; i++) {
bytes[i] = binary_string.charCodeAt(i);
}
return bytes.buffer;
};

const uint8ToBase64 = u8Arr => {
const CHUNK_SIZE = 0x8000; //arbitrary number
let index = 0;
const length = u8Arr.length;
let result = '';
let slice;
while (index < length) {
slice = u8Arr.subarray(index, Math.min(index + CHUNK_SIZE, length));
result += String.fromCharCode.apply(null, slice);
index += CHUNK_SIZE;
}
return btoa(result);
};

readFile = () => {
RNFS.readFile(filePath, 'base64').then(contents => {
setPdfBase64(contents);
setPdfArrayBuffer(base64ToArrayBuffer(contents));
});
};