How to Connect a USB Flash Drive to an iPhone

To connect a USB drive to an iPhone, use a compatible Lightning or USB-C adapter, attach the flash drive, and open the Files app. The drive should appear under Browse > Locations when the iPhone supports the drive format, provides enough power, and runs a compatible iOS version.

Steps

Check the iPhone port. Use a Lightning-to-USB adapter for older iPhone models or a USB-C adapter for iPhone 15 and newer models.
Connect the USB flash drive. Insert the drive into the adapter, then connect the adapter to the iPhone.
Open the Files app. Select Browse, then check the Locations section for the drive name.
Open or manage files. Tap a file to view it, or use Copy, Move, Share, and Rename options.
Eject the drive safely. Close active files before disconnecting the adapter and USB drive.

Common Issues and Fixes

USB flash drive not showing on iPhone: The adapter may lack data support, or the drive may need more power. Use an Apple-certified or MFi-certified adapter, and test a powered USB hub if necessary.
Drive appears but files cannot open: The file format may not be supported by iOS. Convert files to compatible formats, such as JPEG, HEIF, MP4, MOV, PDF, or common Office formats.
Drive is not detected at all: The storage device may use an unsupported partition or file system. Reformat the drive as exFAT or FAT32 after backing up stored data.
Connection repeatedly disconnects: A damaged cable, loose adapter, or insufficient power can interrupt access. Replace the adapter or connect the drive to a powered hub.
Files are read-only: The drive may have write protection or an incompatible format. Disable physical write protection or reformat the drive using a computer.

💡Protip:

USB-C iPhones generally support direct connection to USB-C flash drives, but high-power drives may still require external power. Lightning iPhones often need a Lightning-to-USB 3 Camera Adapter with power input for larger or spinning drives.

Quick Tips

The Files app displays supported external storage only while the drive remains connected.
Back up important files before reformatting, because formatting permanently erases drive data.