Why is there 2Gb file size limit for uploading from the web (Flash based uploads) to the KMC?

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The technical limitation is in the Flash upload capability, as the Flash plugin subsystem operates in 32bits, and the maximum upload size (without chunking) is 2Gb. Flash apps cannot chunk a file the way  the HTML5 File API allows.

Currently, the HTML5 upload in KMS is chunked and not multi-session. The HTML5 (JavaScript) File API implements chunking and the selected file is broken into chunks that are uploaded one by one in consecutive, independent HTTP requests. Therefore, when utilizing KMS, this limitation does not exist when using a modern browser (IE10+ , Chrome, FireFox), as the files are broken down in small chunks during upload.

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