Hi!
> Sure, an app-dev could write a validation method, but I think 0-byte
> is somewhat equal to "not submitted".
>   
I don't think so. A 0-byte file is a valid file (might be a flag-file to
trigger something).
If you treat a 0-byte file as fake, what would you do with files with
just one space.

I think a validator is the correct way to deal with, having a
minFileSize=, or contentMimeType= etc.

Ciao,
Mario

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