It's possible to include a check of the file's size before submitting it. But is the file being submitting from within it (using a Submit button, for example), or is it being uploaded to a web-site?
Its being uploaded to a website and the file size limit is 5 MB. Users are uploading files into our interactive PDF at no limit, currently. We hope to set restrictions directly into the interactive PDF.
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You can set a file-size limit in your HTML page. There's no need to have a double-check... Inside the PDF file it's more difficult to implement such a control because the file-size doesn't change until you actually save the file, so someone can attach multiple files, click the "Validate File Size" button and get a positive reply, but then when they actually save the file it will go beyond 5MB and the web-site won't accept it, which is annoying.