Hello,
You will need Apple’s Lightning to USB 3 Adapter.
iPadOS 13 supports the following disk formats with a GUID partition scheme:
- macOS Extended journaled — YES Read and Write
- APFS - NO
- FAT32 — SOME*
- exFAT — SOME**
- NTFS — NO
*iPadOS 13 supports solid state devices formatted as FAT32 such as a SD card. iPadOS 13 does not supports mechanical hard disks formatted as FAT32.
** iPadOS 13 supports disks formatted as exFAT as long as it was formatted with Disk Utility on a Macintosh. The disk cannot be formatted by Windows.