Python Magic not working with Django on Digitalocean server

Question

I've recently been deploying a Django project on a digital ocean server (ubuntu). I'm using Nginx and securing the connection with lets encrypt. Here's my problem: I was able to use python magic to validate uploads (during development), but it doesn't seem to be working on on the production server. Here's my form validation:

class PostForm(forms.ModelForm):

    def clean_sound(self):
        file = self.cleaned_data.get('sound',False)
        mime = magic.from_buffer(file.read(), mime=True)
        print(mime)
        if not mime == 'audio/mpeg':
            raise forms.ValidationError('File must be mp3')
        else:
            return file


    class Meta:
        model = Places
        fields = [
        'usersave',
        'title',
        'longitude',
        'latitude',
        'sound',

        ]

So yeah, it works perfectly fine on the development server, but throws the 'File must be mp3' validation error every time on the production server. Even if it is the correct file type. What gives?