After adding setting of the whitelist by note 2621454 you can set File path as connection.
But when we want to export planning (model) data as file, the error "Access to the path specified by the connection is not permitted. Contact your Administrator"
You have confirmed that the File Server Connection is working correctly in your tests and you can reach the folder path
SAP Analytics Cloud
For exporting models, to another file server location allowlist (allow list) must be configured. Only file server paths allowed by this allow list can be accessed when exporting a model.
Create the allowlist.txt through the step described on the online help: Allowing Data Import and Model Export with a File Server
allow list allowlist , KBA , LOD-ANA-PL , Planning , How To