Nice field plugin. Though i have some usability issues. End-users are novices in technical stuff like filesizes and types etc. Especially the uploading behavior of the browser and the submission time can be a problem. I suppose they need assistance through:

1. A better visual indicator or a (fake) progress bar would be helpful.
2. The allowed filesize is always in bytes!? This is really confusing for the user. In Frontend it should read KB or MB! Much easier to read und understand.
3. Also the minimum displays "0" ?! It does not make sense for the user. If there is a value >0 it might be useful to show it... in most cases this value starts with 0, so I would suggest to show the maximun value only.

Thanks for listening.