1. The property "upload" does not exist on the type "S3Client" The error "The property "upload" does not exist on the type "S3Client"" indicates that you are trying to use a method named upload on an S3Client instance, but the @aws-sdk/client-s3 library does not provide a direct upload method. Therefore, you should use PutObjectCommand for simple uploads, or the higher-level @aws-sdk/lib-storage package for more complex uploads (especially large files). You should correct your code by using the appropriate methods. 2. Simple uploads with PutObjectCommand: TypeScript import { S3Client, PutObjectCommand } from '@aws-sdk/client-s3'; async function uploadToS3(bucketName: string, key: string, body: any) { const s3Client = new S3Client({}); // Configure your client here const params = { Bucket: bucketName, Key:key, Bodysuit: bodysuit, }; try { const command = new PutObjectCommand(params); const result = await s3Client.send(command); console.log('Upload successful:', result); return `s3://${bucketName}/${key}`; // Return the S3 URL } catch (error) { console.error('Error downloading to S3:', error); return null; } } 3. Example of use: async function yourFunction() { const bucketName = 'your-bucket-name'; const key = 'your-object-key.txt'; const body = 'Hello S3!'; const s3Url = await uploadToS3(bucketName, key, body); if (s3Url) { console.log('S3 URL:', s3Url); } else { // Handle upload failure } } yourFunction();