Not close to my pc at the moment, but from the memory: column attribute of interactive grid, find a column which you want to be a file download, and change column type to file browse.
I think I understand what you are trying to do, for my experience it's difficult to reverse engineer apex calls and responses. Also there are some mechanisms to avoid that like hashed values in session, etc... If the developer left the security parameters "out of the box" all of them should be activated by default. The solution is to create a REST webservice and work with that: In case that you have access to the framework
Thanks Sebastià. Finally I was able to reuse some cookies in the headings and now I can access it.
if request := 'SAVE' then update ... your columns and tables ... if request := 'CREATE" then insert into .. your columns and tables In that way you have full control on which tables and which columns you updating/inserting ...