Non-ASCII Filename Support

Quart-Uplaods use Werkzeug’s secure_filename() to check filename, it will omit Non-ASCII string. When the filename is completely consist of Non-ASCII string, such as Chinese or Japanese, it will return empty filename like .jpg. If your files may encounter a situation like this, you have to set it’s name or generate random filename:

await uset.save(file, name='photo_123.')
# If name ends with a dot, the file's extension will be appended to the end.