Folder sometimes found and sometimes not found

i have web that can uploaded file and save it to local storage. but when i got the file back, sometimes the folder of file can be detect but sometimes it’s say not found. i want get the file back to played it at audio controls. first, when i uploaded file, the file cannot be play. second, when i open new web, the file can be played. at the same time, when i uploaded new file again, the new file cannot be played until i open new web. at my terminal:

here’s my html:

<audio controls="controls">
   <source src="/media/mp3/{{}}" type="audio/mpeg">

def homepage(request):
    form = AudioForm()
    last_audio = Audio_store.objects.last()
    if request.method == "POST":
        form = AudioForm(request.POST, request.FILES)
        if form.is_valid():
            audio = form.cleaned_data.get("audio")
            context={'form':form, 'last_audio':audio}
        return render(request, 'homepage.html', context)

    context={'form':form, 'last_audio':last_audio}
    return render(request, "homepage.html", context=context)

i was already delete database and create again, but it’s still same. please help me, i don’t know what’s wrong. i was using chrome, incognito and microsoft edge, and the result its same. i don’t know what function cleaned_data, is that delete data?