write rights on storage
I get errors with the split worker:

```
PermissionError: [Errno 13] Permission denied: '/assets/nateraw/huggingpics-data-2/--/nateraw--huggingpics-data-2/train/0/image/image.jpg'
```

write rights on storage: I get errors with the split worker:

```
PermissionError: [Errno 13] Permission denied: '/assets/nateraw/huggingpics-data-2/--/nateraw--huggingpics-data-2/train/0/image/image.jpg'
```
