Hello, I've been working on implementing dynamic PSK management and encountered the issue mentioned in the documentation: "The filename should be dynamically expanded if it has a '%' expansion in it." We are trying to scale DPSK by splitting our PSK keys into separate CSV files, one per customer. According to the documentation, we should be able to use expansions like %{control:customer_code} directly in the filename directive within the dpsk module configuration. Here is our desired configuration in /etc/freeradius/3.0/mods-enabled/dpsk: dpsk {     cache_size = 1024     cache_lifetime = 86400     filename = "/etc/freeradius/3.0/psk_files/%{control:customer_code}.csv"     gen_pmk = yes } However, when we start FreeRADIUS with this configuration, we encounter the following error: Unable to check file "/etc/freeradius/3.0/psk_files/%{control:customer_code}.csv": No such file or directory /etc/freeradius/3.0/mods-enabled/dpsk[66]: Failed parsing configuration item "filename" /etc/freeradius/3.0/mods-enabled/dpsk[66]: Invalid configuration for module "dpsk" It appears that FreeRADIUS attempts to validate the path /etc/freeradius/3.0/psk_files/%{control:customer_code}.csv at startup, which fails because the variable %{control:customer_code} is not set at that time. So  the /etc/freeradius/3.0/psk_files/%{control:customer_code}.csv doesn't exist. We have implemented a workaround where we use a static filename pointing to a symlink (current.csv) that we update dynamically via an exec module before calling dpsk in the authorize section. This approach works but feels less elegant than using the built-in dynamic filename expansion. Could you please confirm if it's possible to use attribute expansions directly in the filename directive as suggested by the documentation? Or is the static symlink approach the recommended way to handle this scenario? Any clarification or example configuration demonstrating the intended use of dynamic filenames would be greatly appreciated! Thank you Emile