transfer data from iphone to ssd

See -> Connect external storage devices to iPhone

Connect external storage devices to iPhone – Apple Support (UK)

If the iPhone has an Apple Lightning connection port, you can use a SanDisk iXpand flash drive to use as an external hard drive. They are available in various sizes.

You can also use that iXpand flash drive as a tool to save the photos to a real external hard drive afterwards.

iXpand Flash Drive are available at Apple Store and at Apple Authorized Service Providers.

iXpand flash drive app can be downloaded from the App Store.

See -> SanDisk iXpand-flashdrive Go 

SanDisk 64 GB iXpand Flash Drive Go - Apple

Then download the SanDisk iXpand Drive app from the App Store, see -> 

https://apps.apple.com/us/app/sandisk-ixpand-drive/id1079870681

Upload to iCloud and download using any PC/Mac