I found the code in sqlhtml.py, the empty upload value is '' or default

elif field.type == 'upload':
                f = self.vars[fieldname]
                fd = '%s__delete' % fieldname
                if f == '' or f is None:
                    if self.vars.get(fd, False):
                        f = self.table[fieldname].default or ''
                        fields[fieldname] = f
                    elif self.record:
                        if self.record[fieldname]:
                            fields[fieldname] = self.record[fieldname]
                        else:
                            f = self.table[fieldname].default or ''
                            fields[fieldname] = f
                    else:
                        f = self.table[fieldname].default or ''
                        fields[fieldname] = f
                    self.vars[fieldname] = fields[fieldname]
                    if not f:
                        continue
                    else:


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