Is it impossible to upload a local PDF file on react-native-view-pdf?

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No, it is possible to upload a local PDF file on react-native-view-pdf. You can use the "source" prop to specify the path of the local PDF file. Here is an example:

import React from 'react';
import { View } from 'react-native';
import PDFView from 'react-native-view-pdf';

const MyPDFViewer = () => {
  return (
    <View style={{ flex: 1 }}>
      <PDFView
        source={{ uri: '/path/to/local/file.pdf' }}
        style={{ flex: 1 }}
      />
    </View>
  );
};

export default MyPDFViewer;

Note that the path to the file should be relative to the root folder of your project.