Can't create a directory in a Sagemaker Endpoint? Error Read-only file system

Question

I'm deploying an endpoint using a Pytorch model, in the input_fn I have the following:

os.mkdir('outputs')
os.mkdir('outputs/assets')

At the end of the outpu_fn I remove the output folder

But when invoking the endpoint I get the following error:

OSError: [Errno 30] Read-only file system: 'outputs'

Am I not allowed to create a folder in /opt/ml/model ?