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How to Build a Mobile Uploader MVP for Customer Testimonial Videos in 48 Hours

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Customer testimonial videos are incredibly valuable, but getting users to upload them isn’t always easy.

You have to handle large video files, unstable mobile networks, and a recording process that feels simple and smooth, all while keeping your MVP quick to build.

The good news is you don’t need deep knowledge of video encoding or complex backend systems.

In this guide, we’ll walk through building a mobile uploader that handles video testimonials professionally, even in less-than-ideal conditions.

If you’re validating a new idea or trying to ship something fast, this approach can take you from nothing to a working uploader MVP in about 48 hours.

Key Takeaways

Now, let’s look at why building video handling yourself becomes so difficult.

Why Building Your Own Video Infrastructure Is a Trap

Building your own video system looks easy at first, but it quickly turns into a lot of extra work. Teams end up spending weeks dealing with:

And solving all of these challenges matters because testimonial videos can have a huge impact on conversions and trust. Research from Trustmary shows that adding video testimonials to a landing page can boost conversions by up to 80%. 

A Vocal Video survey found that 72% of marketers see an ROI between 50% and 500%, and more than half get returns above 100%.

The good news is you don’t have to build all of this from scratch. Services like Filestack, Cloudinary, or AWS S3 with MediaConvert take care of things like encoding, compression, and reliability so you can focus on your actual product.

With that in mind, let’s look at a simple way to build a reliable mobile uploader without all that complexity.

How to Build a Reliable Mobile Video Uploader

In the steps below, you’ll set up a lightweight system that lets users record, preview, and upload videos smoothly, even on slow mobile networks.

Step 1: Set Up Your Basic HTML Structure

Let’s start with a simple mobile-friendly interface:

<!DOCTYPE html>
<html lang=“en”>
  <head>
    <meta charset=“UTF-8” />
    <meta name=“viewport” content=“width=device-width, initial-scale=1.0” />
    <title>Customer Testimonial</title>
   </head>
  <body>
    <div class=“container”>
      <h1>Share Your Testimonial</h1>
      <p class=“subtitle”>
        Record a short video telling us about your experience! Your feedback
        helps others make informed decisions.
      </p>

      <!– Button to open Filestack picker –>
      <button id=“uploadBtn”>Record or Upload Video</button>

      <!– Video preview section (shown after upload) –>
      <div class=“video-preview” id=“videoPreview”>
        <video id=“videoPlayer” controls></video> <!– Embedded video player –>
        <div class=“video-info” id=“videoInfo”></div> <!– Shows filename, size, etc –>
      </div>

      <!– Status message box –>
      <div id=“status” class=“status”></div>
    </div>

    <!– Filestack SDK to enable video uploading & recording –>
    <script src=“<https://static.filestackapi.com/filestack-js/4.x.x/filestack.min.js>”></script>
    <!– Your custom JS logic –>
    <script src=“script.js”></script>
  </body>
</html>
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Here’s what it will look like:

Once the basic UI is ready, the next step is allowing users to actually record and upload videos.

Step 2: Initialise Filestack with Video Recording Enabled

This is where things get simple. Filestack’s picker has a built-in video recorder that works on mobile, handles compression on its own, and supports resumable uploads. And you only need a few lines of code to use it.

Add the following code to your script.js file.

Step 2.1: Initialise the Filestack Client

This connects your app to Filestack using your API key.

// Initialise Filestack client
// Get your free API key from <https://dev.filestack.com>
const FILESTACK_API_KEY = “YOUR_API_KEY_HERE”;
const client = filestack.init(FILESTACK_API_KEY);

Step 2.2: Connect Your UI Elements

Link all the buttons and containers in your HTML so you can update them during upload.

// Get UI elements
const uploadBtn = document.getElementById(“uploadBtn”);
const videoPreview = document.getElementById(“videoPreview”);
const videoPlayer = document.getElementById(“videoPlayer”);
const videoInfo = document.getElementById(“videoInfo”);
const statusDiv = document.getElementById(“status”);

Step 2.3: Configure the Picker

Set the upload rules, like allowed formats, recording options, size limits, and progress tracking.

// Configure Filestack picker options
const pickerOptions = {
  accept: [“video/*”], // Only allow video files
  maxFiles: 1,  // Only one video at a time

  // Allow users to either upload or record videos
  fromSources: [
    “local_file_system”, // Upload existing videos
    “video”, // Record video using device camera
    “url”, // Upload from a video URL
  ],

  // Basic video transformations (optional)
  transformations: {
    crop: false,
    circle: false,
    rotate: false,
  },

  // Limit video size and resolution
  videoResolution: “1280×720”, // Limit resolution to save bandwidth
  maxSize: 100 * 1024 * 1024, // 100MB max file size

  // Upload configuration
  uploadInBackground: false, // Show progress to user

  modalSize: [800, 600], // Picker modal size

  // Handle successful upload
  onUploadDone: (result) => handleUploadSuccess(result),

  // Handle failed upload
  onFileUploadFailed: (error) => handleUploadError(error),

  // Show upload progress
  onFileUploadProgress: (progress) => {
    const percentage = Math.round(progress.totalPercent);
    showStatus(`Uploading: ${percentage}%`, “info”);
  },
};

Step 2.4: Open the Picker on Button Click

When the user clicks the upload button, the Filestack video picker opens.

// Open Filestack picker when user clicks the button
uploadBtn.addEventListener(“click”, () => {
  client.picker(pickerOptions).open();
});

Step 2.5: Handle Successful Uploads

Show the uploaded video, display its details, and save the metadata.

// Called when the video upload succeeds
function handleUploadSuccess(result) {
  const file = result.filesUploaded[];  // Get uploaded file info

  // Show the uploaded video in the preview player
  videoPlayer.src = file.url;
  videoPreview.style.display = “block”;

  // Display file details
  const fileSize = (file.size / (1024 * 1024)).toFixed(2);
  videoInfo.innerHTML = `
        <strong>Upload Complete!</strong><br>
        Filename: ${file.filename}<br>
        Size: ${fileSize} MB<br>
        Type: ${file.mimetype}
    `;

  // Show success message
  showStatus(
    “Video uploaded successfully! Thank you for your testimonial.”,
    “success”
  );

// Send uploaded video details to backend
  saveToBackend({
    url: file.url,
    filename: file.filename,
    size: file.size,
    mimetype: file.mimetype,
    handle: file.handle, // Unique identifier for the file
    uploadedAt: new Date().toISOString(),
  });
}
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Step 2.6: Handle Errors Gracefully

If anything goes wrong, show an error instead of breaking the flow.

// Called if upload fails
function handleUploadError(error) {
  console.error(“Upload failed:”, error);
  showStatus(
    “Upload failed. Please check your connection and try again.”,
    “error”
  );
}

Step 2.7: Show Upload Status Messages

Display progress, success, or error messages during the upload.

// Show status messages (uploading, success, error)
function showStatus(message, type) {
  statusDiv.textContent = message;
  statusDiv.className = `status ${type}`;
  statusDiv.style.display = “block”;

  // Auto-hide success messages after 5 seconds
  if (type === “success”) {
    setTimeout(() => {
      statusDiv.style.display = “none”;
    }, 5000);
  }
}

Step 2.8: Save Video Metadata to Your Backend

Store the video details in your database once the upload is done.

// Save video metadata to your backend/database
async function saveToBackend(videoData) {
  try {
    const response = await fetch(“/api/testimonials”, {
      method: “POST”,
      headers: {
        “Content-Type”: “application/json”,
      },
      body: JSON.stringify(videoData),
    });

    if (!response.ok) {
      throw new Error(“Failed to save testimonial”);
    }

    console.log(“Testimonial saved to database”);
  } catch (error) {
    console.error(“Error saving to backend:”, error);
    // Video is already uploaded to Filestack, so this is not critical
    // You can retry or handle this based on your needs
  }
}

And here’s what it will look like after the upload:

The beauty of using Filestack’s built-in uploader is that it automatically handles common network problems:

These features matter even more when you realise that over 60% of all downstream internet traffic is now video, based on data from NCTA.

Handling video smartly isn’t just helpful anymore; it’s essential for a good user experience.

After the video is uploaded, you still need a simple backend to store the video details. Let’s look at an easy way to set that up.

Step 3: Create a Simple Backend Endpoint

Your backend just needs to store the video URL and metadata. Here’s a simple Express.js example:

// server.js
const express = require(‘express’);
const app = express();

// Parse incoming JSON requests
app.use(express.json());

// Serve static files from the “public” folder (HTML, CSS, JS)
app.use(express.static(‘public’));

// Simple in-memory storage (use a database in production)
const testimonials = [];

// Handle POST request when a new testimonial is submitted
app.post(‘/api/testimonials’, (req, res) => {
    const testimonial = {
        id: Date.now(), // Unique ID for each testimonial
        …req.body, // Video data sent from the frontend
        createdAt: new Date() // Timestamp
    };
   
    testimonials.push(testimonial); // Save in memory
   
    console.log(‘New testimonial received:’, testimonial.filename);
   
    // Send a success response back to the frontend
    res.json({ success: true, id: testimonial.id });
});

// Fetch all saved testimonials (useful for testing or admin view)
app.get(‘/api/testimonials’, (req, res) => {
    res.json(testimonials);
});

// Start the Express server
const PORT = process.env.PORT || 3000;
app.listen(PORT, () => {
    console.log(`Server running on port ${PORT}`);
});
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Now that your front-end and backend are ready, the next step is to test how your uploader works in real-world situations.

Testing Your Mobile Uploader

Before you launch, make sure to test these situations:

As you test your uploader, let’s look at some tips to keep in mind to make the recording and upload experience smoother.

Best Practices

Here are a few simple tips to make your video uploader work better and feel smoother for users:

Even with a solid setup, some issues can still pop up. Avoiding these will save you a lot of time.

Common Pitfalls to Avoid

These are mistakes that can cause real problems if you don’t watch out for them:

Conclusion

Building a mobile uploader doesn’t have to be complicated. With the right tools, you can ship something reliable much faster than you might expect.

Start with the basics: record the video, upload it reliably, and show clear error messages when something goes wrong.

You can always add extra features like custom thumbnails, trimming, or advanced compression later, once you’re sure people actually want to record testimonials.

Focus on making the core experience smooth, test on real mobile devices, and make sure your mobile uploader works well even on slow or unstable networks.

Users always prefer a simple tool that works every time over a fancy one that breaks on weak WiFi.

About the Author

Shefali Jangid is a web developer, technical writer, and content creator with a love for building intuitive tools and resources for developers.

She writes about web development, shares practical coding tips on her blog shefali.dev, and creates projects that make developers’ lives easier.

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