flask-reuploaded
                                
                                
                                
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                        [BUG]extensions.py extension
When the uploaded file is all in Chinese, such as "图片.png", the extension function in this file flask_uploads\extensions.py. will return empty.
Maybe you should modify like this:
def extension(filename: str) -> str:
    ext = os.path.splitext(filename)[1] if len(os.path.splitext(filename)[1]) >0 else os.path.splitext(filename)[0]
    if ext.startswith('.'):
        # os.path.splitext retains . separator
        ext = ext[1:]
    return ext