503 Service Unavailable Error When Uploading Files to Storage Bucket

### 👟 Reproduction steps

Hi Appwrite Support Team,
I'm experiencing a "503 Service Unavailable" error when trying to upload files to my storage bucket. I need your assistance to resolve this issue.
Issue Description:
When attempting to upload a 10MB MP3 file to my "audio-files" bucket, I receive the following error:
Error Code: 503
Error Message: Service Unavailable
The error occurs both when uploading through the Appwrite console UI and through the SDK

What I've Already Tried:
Added "mp3" to the allowed file extensions list
Checked my storage quota - I'm using [18MB] GB out of 2 GB on the Free plan
Temporarily disabled Antivirus scanning on the bucket
Verified the file size is under the 50MB limit
Checked status.appwrite.io - no ongoing maintenance reported

### 👍 Expected behavior

Allow to upload mp3 files

### 👎 Actual Behavior

503 error

### 🎲 Appwrite version

Appwrite Cloud

### 💻 Operating system

Windows

### 🧱 Your Environment

_No response_

### 👀 Have you spent some time to check if this issue has been raised before?

- [x] I checked and didn't find similar issue

### 🏢 Have you read the Code of Conduct?

- [x] I have read the [Code of Conduct](https://github.com/appwrite/.github/blob/main/CODE_OF_CONDUCT.md)

Start by reproducing the 503 through both the Appwrite console UI and the SDK with a 10MB MP3 in the audio-files bucket. The report names no repository files or tests; done means identifying why this upload fails despite the extension, quota, antivirus, and size checks, then confirming that MP3 uploads succeed.

Written by the indexing model from the issue text.