ORA-31641: unable to create dump file while trying to export to CIFS share

Hi
We have a 19c database and we are trying to export it to a directory we created pointing to CIFS share
the CIFS share is /blobs
we created a folder there 

[oracle@tnexap01dbadm01 blobs]$ ls -ltr |grep test_uata

drwxr-xr-x 2 oracle oinstall   64 Oct 20 13:40 test_uata_exp

select directory_name,directory path from dba_directories where directory_name='CIFS_DIR_TEST'
CIFS_DIR_TEST            /blobs/test_uata_exp

After that we tried to export using expdp but getting this error

ORA-39001: invalid argument value

ORA-39000: bad dump file specification

ORA-31641: unable to create dump file "/blobs/test_uata_exp/testattaud.dmp"