Cannot write to local storage (NFS mount)

I have a docker container running the official nextcloud image.
There is an NFS mount mounted to /cloud on the docker container.
I have /cloud configured as a local storage point in the external storage configuration.

I can list/open all the files without any issue. The problem is trying to upload anything.
I get the error message:

Not enough free space, you are uploading 115 KB but only 0 B is left

Even I can write to the /cloud directory through bash without any difficulties, even as the www-data user. So I’m not sure how to try and fix this. Is there a way to turn off directory size checking for external storage mounts?

Thanks everyone!

is it perhaps the temp folder where the uploads are buffered?