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Hello.
It is difficult to make an accurate judgment without checking the Lambda log for errors, but for example, it is possible that Lambda is timing out because there are too many files to process, or that the number of Lambda executions is too large and the concurrency limit is being reached.
https://docs.aws.amazon.com/lambda/latest/dg/lambda-concurrency.html
One thing to check here is that when there are frequent events, you'll often find that the SQS event notification to the Lambda function contains multiple entries. To put it another way: The event notification contains an array ("list" in Python terms) of files that were uploaded.
In your code: Make sure you are processing all of the events that are delivered, not just the first one. Because if the Lambda function returns successfully then the Lambda service will mark all of the events passed in via SQS as completed even if the code has only processed the first one.
