[Answered ]-Django Encrypt FileField with Fernet object has no attribute '_committed' occurred

it’s cause you cannot save encrypted(bytes) to model

try this

from django.core.files.base import ContentFile

for index, file in enumerate(files):
    f = Fernet(settings.F_KEY)
    pdf = file.read()
    encrypted = f.encrypt(pdf)
    content_file = ContentFile(encrypted, name=your_filename)
    PDF_File.objects.create(
        acct = a,
        pdf = content_file
    )

ref from here https://docs.djangoproject.com/en/4.0/topics/http/file-uploads/