Is it perhaps somehow possible to access ISE's internal storage with software like WinSCP?
From what I see you can only use external servers to upload stuff from ISE onto but how about using ISE itself as an FTP/SCP server?
(The only reason I'm asking a seemingly silly question like this is because our customer doesn't have any permanent FTP solution available, so we're forced to beg some of their more friendly end users to e.g.: upload a certain file to one of their computers, install and enable Tftpd64 on it and leave it online for us for a few hours - so hardly an optimal solution for any remote network engineer)