matusgallik008

You're good mate. I meant exaclty what aprilnya said. I thought you are using the Lambda just to validate the 10mb limit - and just for that you don't need the lambda :) and could save yourself some cents & effort.

But if you do resizing as well, then ofc you need the Lambda (or some other compute engine).

Well, security for starts. Having user A upload a malicious_file.png and then user B download it would not be ideal. Secondly, UX - having thumbnails for files can increase the loading speed. Arguably not the most important UX feature, but we have the resources to spend on this, so why not.

I believe AWS S3 allows setting the Content-Length header as well. So you might not need the lambda

Thanks for the insights! I had a look at ClamAV - never heard/worked with it. This was something I was looking for.

Do you also handle large files e.g. videos with lambda? Don't you struggle with Lambda limits then?