SANDISK 1TB Creator Phone SSD - Up to 1,000 MB/s - Compatible with MagSafe for Your USB-C Smartphone - Shoot in ProRes with iPhone 15 Pro/Pro Max and iPhone 16 Pro/Pro Max - SDSSDE62C-1T00-G25

If iCloud is stopping you from uploading things just use Google drive on iPhone lol or tons of other cloud storage services. You're not actually locked to iCloud. Idk how old your iPhone is but on the 17 pro you don't need adapters...you just need the right SSD cable to support usb 3.0 Buy something like this (it's meant to be used on the go with iPhone)https://a.co/d/0fLrsgDa If your ssd is already usb3.0 then make sure it's formatted in exFAT and you use the right data transfer cable otherwise iPhone won't read it. If you don't have a 17 pro then use jellyfin or buy cloud storage from someone other than icloud