Well, color me "dumb," but if you can filter as part of the file TEXT description "please share," or ".exe," couldn't you also filter "399.5" or "865?"

I guess the size is not PART of the description or "title," at least as it stands now - but if you can PREVIEW a file before it's even finished, there should be some "lookahead" mechanism that could "lookahead and check size?"

Here's hoping!