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.
SSD Speed cap to 40MB/s with USB-C cable - Apple Community
SSD write speed dropped 15 times than read speed. Read: 480+... - HP Support Community - 7246342
SSD Speed cap to 40MB/s with USB-C cable - Apple Community
Samsung T7 Portable SSD | Samsung Semiconductor Global
Samsung T5 Portable SSD Review - Dong Knows Tech
Amazon.com: ORICO 128GB Mini M.2 NVME Portable SSD External Solid State Drive Hard Drive Up to 940MB/s with 3D NAND/USB 3.1 Gen 2 Type C for Laptop Mac Phones and More (SSD
Samsung T1 portable SSD review: the best things come in small packages - Review - Reviews | XSReviews
Samsung Announces Portable SSD T5 | TechPowerUp
Amazon.com: Samsung T3 Portable SSD - 1TB - USB 3.1 External SSD (MU-PT1T0B/AM) : Electronics
Samsung T5 Portable SSD Review - Dong Knows Tech
Amazon.com: ORICO 256GB Mini M.2 NVME Portable SSD External Solid State Drive Hard Drive Up to 940MB/s with 3D NAND/USB 3.1 Gen 2 Type C for Laptop Mac Phones and More (SSD
SSD write speed dropped 15 times than read speed. Read: 480+... - HP Support Community - 7246342