Tried an experiment to add external NVME storage w/ passthrough charging... Description in comments. : r/SteamDeck
For anyone wanting to expand their S21 storage, I recommend portable SSDs from Samsung. Smaller than a credit card, connects directly to your phone, and optional password lock encryption on the drive.
Be careful when buying these. SanDisk Extreme Pro Portable SDSSDE81-2T00…. WORKS. The much cheaper SanDisk Extreme Portable SDSSDE61-2T00 shuts off after 50 seconds : r/sigmafp
Buffalo SSD-PUT Portable SSD Review | PCMag
I 3D printed an SSD MagSafe clip for the T7 : r/iphone