[V5] Drive uploads 0 byte files to S3

[aayush123]

So I've noticed a peculiar issue with Drive, wherein uploading anything other than a PDF puts a 0 byte file in S3.
The upload works fine the first time the service is started and then every subsequent upload other than a PDF uploads a 0 byte file.

My FileService for reference:

import { MultipartFileContract } from '@ioc:Adonis/Core/BodyParser';
import FileValidator from './FormioValidator';
import Drive from '@ioc:Adonis/Core/Drive';
import retry from 'async-await-retry';
import Logger from '@ioc:Adonis/Core/Logger';

class FileService {
  /**
   * Function to upload file to storage.
   * The function returns an object that mimicks the fields mentioned in [form.io documentation](https://help.form.io/developers/file-storage#custom-url)
   *
   * @param   {object}                 inputs  Inputs object containing id and type of entity
   * @param   {MultipartFileContract}  file    The file to be uploaded
   *
   * @return  {object}                         Object containing data about the file uploaded.
   */
  public async upload(
    inputs: { id?: string; type?: string; dir?: string },
    file: MultipartFileContract
  ) {
    await FileValidator.fire({ ...inputs, file }, 'upload');
    const { id, type, dir } = inputs;
    let filePath = '';
    filePath += type ? `${type}/` : '';
    filePath += id ? id : '';
    if (dir) {
      filePath = `${dir}`;
    }
    /**
     * Try uploading a file in S3, retry in case of exceptions
     * retriesMax: 10 (retry 10 times maximum)
     * interval: 100 (100ms interval)
     * interval grows exponentially with growth factor of 2
     * Refer to [docs](https://www.npmjs.com/package/async-await-retry) for customization
     */
    file = await retry(
      async (file: MultipartFileContract, filePath: string) => {
        // Upload file to drive
        await file.moveToDisk(filePath);
        return file;
      },
      [file, filePath],
      {
        retriesMax: 10,
        interval: 100,
        onAttemptFail: (errorMsg: any) => {
          Logger.debug(
            `Unsuccessful upload attempt #${errorMsg.currentRetry + 1} for file ${file.clientName}`
          );
        },
      }
    );
    return {
      fileName: file.fileName,
      name: file.clientName,
      mimetype: `${file.type}/${file.subtype}`,
      path: file.filePath,
      size: file.size,
      entity_type: inputs.type ?? null,
      entity_id: inputs.id ?? null,
      url: `/${encodeURIComponent(`${filePath !== '' ? `${filePath}/` : ''}${file.fileName}`)}`,
    };
  }
}

export default new FileService();