diff --git a/lib/s3.ts b/lib/s3.ts
index 177f538..7c41bcc 100644
--- a/lib/s3.ts
+++ b/lib/s3.ts
@@ -2,17 +2,20 @@ import { S3Client, PutObjectCommand, GetObjectCommand, DeleteObjectCommand, List
 import { getSignedUrl } from '@aws-sdk/s3-request-presigner';
 
 // S3 Configuration
+// Uses existing MINIO_* environment variables that are shared across the application
 export const S3_CONFIG = {
-  endpoint: process.env.S3_ENDPOINT || process.env.MINIO_S3_UPLOAD_BUCKET_URL || 'https://dome-api.slm-lab.net',
-  region: process.env.S3_REGION || process.env.MINIO_AWS_REGION || 'us-east-1',
-  bucket: process.env.S3_BUCKET || 'pages',
-  accessKey: process.env.S3_ACCESS_KEY || process.env.MINIO_ACCESS_KEY || '',
-  secretKey: process.env.S3_SECRET_KEY || process.env.MINIO_SECRET_KEY || ''
+  // Remove trailing slash from endpoint if present
+  endpoint: (process.env.MINIO_S3_UPLOAD_BUCKET_URL || process.env.S3_ENDPOINT || 'https://dome-api.slm-lab.net').replace(/\/$/, ''),
+  region: process.env.MINIO_AWS_REGION || process.env.S3_REGION || 'us-east-1',
+  // Use MINIO_AWS_S3_UPLOAD_BUCKET_NAME for pages bucket (shared with other parts of the app)
+  bucket: process.env.MINIO_AWS_S3_UPLOAD_BUCKET_NAME || process.env.S3_BUCKET || 'pages',
+  accessKey: process.env.MINIO_ACCESS_KEY || process.env.S3_ACCESS_KEY || '',
+  secretKey: process.env.MINIO_SECRET_KEY || process.env.S3_SECRET_KEY || ''
 };
 
 // Validate required S3 configuration
 if (!S3_CONFIG.accessKey || !S3_CONFIG.secretKey) {
-  console.error('⚠️  S3 credentials are missing! Please set S3_ACCESS_KEY and S3_SECRET_KEY environment variables.');
+  console.error('⚠️  S3 credentials are missing! Please set MINIO_ACCESS_KEY and MINIO_SECRET_KEY environment variables.');
   if (process.env.NODE_ENV === 'production') {
     throw new Error('S3 credentials are required in production environment');
   }