it has to work , but some times on VM's it wont work,
that time you can add these simple lines which gets your work done..

    zip_content = await audio_zip.read()
    zip_buffer = io.BytesIO(zip_content)
    zip_buffer.seek(0)

do this at first,

then if file is read once and if you want to read it again them pass the same.

zip_buffer.seek(0)

before reading file, this will solve the issue..