Greetings DimmNet,
We'd like to provide you with a few steps that may be able to assist you:
"Connect external storage devices to iPhone
You can use the Files app and other supported apps to access files stored on external devices, such as USB drives and SD cards, connected to your iPhone.
Connect a USB drive or an SD card reader
- Attach the USB drive or SD card reader to the charging port on your iPhone using a compatible connector or adapter.
You may need the Lightning to USB Camera Adapter, Lightning to USB 3 Camera Adapter, or Lightning to SD Card Camera Reader (all sold separately).
Note: A USB drive must have only a single data partition, and it must be formatted as FAT, FAT32, exFAT (FAT64), or APFS. To change the formatting of a USB drive, use a Mac or PC.
2. Do any of the following:
• Insert an SD memory card into a card reader: Don’t force the card into the slot on the reader; it fits only one way.
Note: You can import photos and videos from the memory card directly to the Photos app. See Import photos and videos on iPhone.
• View the contents of the drive or memory card: In a supported app (for example, Files), tap Browse at the bottom of the screen, then tap the name of the device below Locations. If you don’t see Locations, tap Browse again at the bottom of the screen.
• Disconnect the drive or card reader: Remove it from the charging port on iPhone.
Note: The Lightning to USB 3 Camera Adapter can be powered with a USB power adapter. This allows you to connect USB devices with higher power requirements, such as external hard drives, to iPhone."
More details here: Connect external storage devices to iPhone
If you're still unable to get your Samsung T7 connected to your iPhone, we suggest that you reach out to Apple directly. They will be able to assist you further. You can follow this link to connect with them: Get Support
Thanks for connecting with Apple Support Communities.
Take care.
