How do install apps onto an sd card?

I’m on a chromebook. now as we all know chromebooks are already TERRIBLE for gaming as it is, and now i’m running out of memory much quicker than expected. i have a 1tb sd card inserted but i don’t see any way to install flatpak apps onto it, i searched it on google but most methods seem outdated as when i try them i usually get path not found or permission errors. can anyone give me a "STRAIGHTFORWARD answer on how to install flatpak apps on a chromebook’s SD Card?

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You need to add a custom installation pointing to the sd card: Adding a custom installation

Or else you have to be specific on what you’ve tried (i.e. your input & the error messages).