* Permissions are not set by default for uploaded files. Depends on the filesystem/umask settings.
* Files may be uploaded to temp files first, which may impact permissions (e.g., 0o600 instead of 0o644).
* Permissions on directories can be set with:
```python
FILE_UPLOAD_PERMISSIONS = 0o644
FILE_UPLOAD_DIRECTORY_PERMISSIONS = 0o755
```