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Step-2: Once the bucket is created select the bucket and select upload
Step-3: Browse to where your .zip file is located in your system (Note: It must contain all the dependencies required by the program inside the .zip file along with its corresponding package.json file for lambda to execute successfully)
Step-4: After clicking on open click next to go to set permissions and make sure the bucket has read and write access so lambda can access the bucket and its data when required
Step-5: Click upload
Step-6 Go to your bucket, Select the .zip file as shown and copy its object URL onto your clipboard, This will be used in Step-10
Step-7: Go to services, Select lambda and then create function
Step-8: Click on your newly created lambda function scroll down under configuration and look for Execution role, Under that make sure you use a role which has S3 read and write access(Refer to this link)
Step-9: Now scroll up to Function code and select Code entry point and under that select Upload file from S3
Step-10: Paste the S3 object URL and click save
Step-10: Paste the S3 object URL and click save
Step-11: Run your lambda function
This is the best practice to upload your code to lambda when code size is ≥ 10 Mb since S3 provides a more stable upload and lambda can access your application using the internal amazon network