I'm not sure if this is the correct forum for this post, but I wonder if it would be possible/good to make the script on the submission form auto-remove commas from the 'size' number.
The reason being, Windows displays this value with commas (ie 1,232,699,392) in its 'properties' window and many people might do like I do and copy/paste it directly from there to avoid typos. I have to manually delete the comas for the submission form which increases the odds I'll make a mistake.
Just a thought