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Learn how to chunk and upload large video files using React Native Expo to Amazon S3, leveraging presigned URLs for efficient data transfer.
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Uploading Large Video Files from React Native Expo to S3

If you’ve ever faced the challenge of uploading large video files from a mobile application to a storage service, you’re not alone. Developers encounter limitations and obstacles when trying to manage this task, especially in frameworks like React Native with Expo.

This blog will walk you through an effective method to upload large video files using chunking techniques, presigned URLs, and the Amazon S3 service. By the end of this post, you’ll have a clear understanding of how to implement this in your own React Native application.

The Problem: Uploading Large Video Files

Many applications, such as Instagram and TikTok, enable users to upload large videos directly from their devices. However, working with React Native, especially through Expo, can present various limitations such as memory restrictions and dependency issues with libraries.

Common Issues Faced

Here are some of the specific challenges faced when attempting to upload large video files:

Network Failures: Fetching files directly can lead to failed network requests due to the size of the files.

Memory Problems: Attempting to read files or process them in bulk can result in memory overloads, crashing the application.

Incompatibility: Some AWS SDKs may not be designed to work seamlessly with React Native, leading to more errors.

The Solution: Chunked Video Uploads

The best practice for uploading large files is to break them into smaller parts (chunks) and upload these parts individually. This method allows for better management of both the network and the device’s memory, significantly reducing the likelihood of errors during upload.

Step-by-Step Implementation

1. Create a Function to Handle Uploads

First, set up an uploadVideos function to initiate the upload process:

[[See Video to Reveal this Text or Code Snippet]]

2. Creating Presigned URLs

You’ll need to interact with your backend to generate presigned URLs:

[[See Video to Reveal this Text or Code Snippet]]

3. Completing the Upload

Once all parts are uploaded successfully, make sure to finalize the upload:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

With this guide, you now have a thorough understanding of how to upload large video files from a React Native Expo application to Amazon S3 using chunked uploads and presigned URLs. Remember, the example code provided is not intended to be copied verbatim but serves as a foundational guideline you can adapt to suit your own application.

By implementing these methods, you can ensure smooth video uploading experiences in your application similar to those offered by popular platforms like Instagram and TikTok.

Feel free to share your experiences or any other strategies you’ve used for handling large file uploads. Happy coding!