You can use the *SAVEFILE* to store the page after a *POSTDATA* command, but the parameters for the *SAVEFILE* command are the filename where the content will be saved and the destination folder. The [ITPilot NSEQL Guide](https://community.denodo.com/docs/html/browse/6.0/itpilot/nseql/list_of_nseql_commands/commands_for_saving_files/commands_for_saving_files) clarifies that it will download the content of the previously selected link, established target URL or canceled navigation, so you don't need to pass the result of the POSTDATA as an argument to this command.
I found some situations where after the PostData action you need to perform additional navigation steps like a click command in order to get the desired content. I find the [Sequence Debugger](https://community.denodo.com/docs/html/browse/6.0/itpilot/generation_environment/generation_envirtonment_tools_-_part_ii/using_the_sequence_debugger/using_the_sequence_debugger) very useful during my Sequence developments.
Hope this helps!