The simple answer is no, there is no size limit. The extra details are important, however. In Flatfile Portal, the amount of time it would take for an upload to be processed depended entirely on your local hardware. In Flatfile Embed, that processing is done on our server, and much more quickly. Flatfile Embed also allows you to interrupt a processing upload once it has begun and return to it later. Do be aware that files larger than 250mb may take longer to upload due to browser limitations.