If your Android phone is running out of storage space, many phones will allow you to insert an SD card, which you can set as the phone's primary storage.

I want to put a bunch of ROMs on my SD card for the various emulators on my Android device. I setup the card as "tablet storage" instead of "portable storage". I see a combined 192 GB in the ...

If you need more space, consider buying microSD cards. These cards can expand storage on the ROG Ally by two or threefold. This guide illustrates how to install games onto your ROG Ally's SD card.