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There are a few potential reasons that could be causing the value to display as undefined when attempting to upload and read a document using React-Native-document-picker:

1. Incorrect file path or file name: Ensure that you are providing the correct file path and file name when attempting to access or upload the document. If the file name or path is incorrect, the document picker may not be able to locate the file and will return undefined.

2. Insufficient or incorrect file permissions: Check that the file has the appropriate read permissions and that the picker has been granted the necessary permissions to access the file. If you don’t have the correct permissions, the document picker may not be able to access the file and will return undefined.

3. Issues with the document picker itself: Make sure that you have installed the document picker correctly and that it is functioning correctly. Check to ensure that there are no errors or issues with the document picker code, and that you are using the most up-to-date version.

4. Incompatibility issues: It’s possible that the document picker may be incompatible with the version of React Native or the device you’re using. Check the documentation to ensure that the document picker you’re using is compatible with your version of React Native, the device, and the operating system.