How to Add ROMS to Steam Deck using Emudeck
From the main EmuDeck screen, locate the tile Quick Actions → USB Transfer Wizard and click the Add more games button.
Insert a USB-C adapter and/or USB-C SSD/Stick to the top port of the Steam Deck (see here for suggestions).
You should see a popup stating Disks & Devices, select the Mount and Open option next to USB DISK (or similar). DO NOT select primary as that is your microSD card. If Dolphin File Manager loads, close that window.
Click the Tile on the screen that states USB Drive.
In the dialog, select the USB Disk and click the OK button.
Click the button Create EmuDeck folders on USB Drive. The folders will then be created for you on the USB Stick for BIOS and ROMs (and all needed subdirectories).
Click the OK button to close out of the dialog.
In the lower right, click the icon for Most Recent Device or Disks & Devices and select Safely remove to the right of your USB DISK.
Remove the USB Stick from the Steam Deck (and the adapter if you don’t have a USB-C port) and install it into your PC. Copy your BIOS/ROM files to their respective folders on the USB DISK.
Safely eject the USB Disk from the PC by clicking the icon in the lower-right of the taskbar.
Re-insert the USB stick into the Steam Deck.
Click the button Copy your ROMs & BIOS to your Steam Deck.
All files will then be transferred to your Steam Deck’s microSD or internal SSD (depends on where you installed EmuDeck).
You can again safely remove your USB Disk from the Steam Deck and re-run Steam Rom Manager to update your game library.
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