It’s pretty straightforward with a plug-in reader. Here’s a simple way to do it:

1. Match the connector: Use a reader that fits your phone’s charging port (some models use USB‑C; others use a different connector).
2. Insert the card: Slide an SD or microSD (in an adapter) into the reader.
3. Connect and open Files: Plug the reader into your phone, then open the Files app and tap Browse. The card should appear under Locations.
4. Copy or import: Tap and hold items to Copy, Move, or Share. Many devices also offer to bring photos/videos into the Photos app.
5. Safely remove: In Files, tap the eject icon next to the card (if shown), then unplug.

Availability of options can vary by device software and the reader you’re using.

To pick a reader that plays nicely with your phone, consider:

• Connector type: Choose a reader that matches your phone’s charging port (USB‑C on newer devices; a different connector on older ones).
• Card slot(s): Decide between SD, microSD, or a combo slot. If you use microSD, a tiny “thumb” reader is handy for travel.
• Power draw: Simple, single-slot readers tend to work more consistently than multi-port hubs that need more power.
• Speed support: UHS‑I support is widely compatible; faster cards can work but may run at reader-limited speeds.
• Extras: A reader with pass‑through charging can help keep your phone powered while transferring.

If you’re unsure, filter by your phone’s port type and card format to narrow options.

A few quick checks can help get it working:

• Unlock and open Files: Make sure your phone is unlocked, then open the Files app and tap Browse to see Locations.
• Check card format: Cards formatted as exFAT or FAT32 are broadly compatible. NTFS or proprietary formats may not mount.
• Try a simpler setup: Disconnect other accessories. Some hubs/readers draw more power than the phone can supply.
• Reseat and clean: Reinsert the card fully, and ensure the reader’s connector is snug and free of debris.
• Swap parts to isolate: Test with a different card or reader to pinpoint the issue.
• Software and restarts: Restarting the phone can help; compatibility can vary by software version.

If it still doesn’t appear, the card or reader may not be supported by your device.

Your phone’s Files and media apps typically handle many common formats, but support can vary by app and software version.

• Photos: Common formats like JPG and PNG usually open and preview. Some advanced camera files may store but not preview without a compatible app.
• Videos: Frequently used MP4/MOV files often play, depending on the video codec used.
• Documents: PDFs and plain text generally open; office files may require their respective apps.
• Archives: ZIP files commonly appear as archives you can view or extract.

If something won’t open, you can still copy it to your phone and use a third‑party app to view or convert it, where supported.

Sometimes. It depends on the reader’s design and how much power it draws.

• Low‑power readers: Simple, single‑slot card readers usually work without additional power.
• Higher‑draw hubs: Multi‑slot readers or models with extra ports may need more power than your phone can provide.
• Pass‑through charging: A reader with a charging port can help if you see messages about power or if transfers stop unexpectedly.
• Cables and adapters: Use short, good‑quality cables to reduce power loss, and avoid daisy‑chaining accessories.

If you encounter power warnings, connecting external power to the reader (when supported) or switching to a simpler reader can help stabilize transfers.