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Why moving files between devices is still awkward

Inside one ecosystem it is easy: AirDrop between Apple devices, Quick Share between Android phones. The trouble starts when an iPhone, an Android phone and a Windows PC all live in one person's day. A work PC on Windows, a personal iPhone and a family member's Android phone is an ordinary mix. What matters then is not the fastest route but the one that works on every device with no extra setup.

Five criteria decide the choice: the per-file size limit, whether the other device can open it, speed, who can see the file in transit, and cost. The table below uses those five. Every numeric limit comes from the service's own documentation; where I could not verify a number, the cell says to check the official page instead of guessing.

Comparison table

The 5 TB and 250 GB figures mean a cloud drive will almost never reject a single file. The real bottleneck is the free space left in your account and your upload speed. Email is the opposite: 20 to 25 MB is easily exceeded by one phone video, so keep email for documents and a few photos.

Pros, cons and traps of each method

Nearby sharing: AirDrop and Quick Share

Fastest and smoothest when you share a room. For years these only worked within their own ecosystems. That changed in November 2025, when Google announced Quick Share and AirDrop interoperability starting with the Pixel 10 [9]. It still does not work for every device pair. Press coverage describes it as working when the iPhone is set to receive from "Everyone for 10 Minutes", and Apple documents that this mode reverts after ten minutes [10]. So it works, but you must touch settings each time: fine for an occasional send, tedious for a family that shares daily. Test your actual pair first and fall back to another method if it fails.

USB cable

No internet, reliable for large transfers, no third-party server. An Android phone appears as a folder once the USB mode is set to file transfer. An iPhone on Windows is reached through photo import or Apple software, and you must tap Trust on the phone. The downsides are cable standards (USB-C or Lightning) and that it is awkward phone to phone. For hundreds of original-quality photos it is still the most dependable choice.

Cloud drive

Upload once and every signed-in device sees the file, with storage and share links included. Three traps: you must sign in, so forgetting to sign out on a borrowed PC exposes your account; free space on Google is shared between Drive, Gmail and Photos [3], so a full photo backup can block a large video; and temporary hand-offs stay until you delete them. Also remember that a link set to "anyone with the link" is open to whoever receives it later.

Messenger self-chat

Already installed, usually with a desktop version, so the barrier is lowest. Telegram documents 2 GB per file (4 GB with Premium) [7], but limits and retention differ by service. The bigger trap is quality: many messengers recompress photos and videos picked from the gallery. If you need originals, look for a send-as-file option and compare the received file size with the original. Work and personal chats also mix in one place.

Email attachment

Universal: you can send to anyone. Gmail allows 25 MB on personal accounts and converts bigger attachments to Drive links [1]. Outlook desktop defaults to 20 MB combined for internet email accounts and 10 MB for Exchange accounts [6]; work accounts may be set differently by an administrator. A permanent record in the mailbox is both a feature and a cost.

Session-code web tools

A short code or QR code links devices briefly and files pass through. No account is needed and a browser is enough on a PC. In exchange you need internet, files pass through temporary storage, and sessions are short. The next section walks through OneSync.

Choosing by situation

• Hundreds of original photos to a PC: a USB cable.
• A document you will need on other devices tomorrow: a cloud drive.
• One link or a short note: messenger self-chat, or text sharing in a session tool.
• A few photos between iPhone and Android without signing in: a session-code web tool.
• One file on a shared or borrowed PC: a browser-based session tool, or USB.
• Sensitive documents such as ID scans or contracts: a direct cable, or encryption you control.

The chooser in the Korean section above (interactive tool, Korean UI) takes five answers: device mix, file size, sensitivity, whether the internet is available and whether you need to keep the file. It returns three candidates from qualitative rules, so read it alongside the table.

A worked OneSync session, and its limits

I build and run OneSync myself; this is the only section that features it, and the other services above are compared on the same criteria. The example sends iPhone photos to a Windows PC. The screenshots in the Korean section show the home screen (create a session, join, scan QR) and the session screen with the codes, QR and countdown.

1. On the PC, open the OneSync web client (onesync-web-cf.setlog.net).
2. Create a session. A 6-character session code, a 2-digit verify code and a QR code appear. The default length is 15 minutes.
3. On the iPhone, open the app and tap Scan QR Code. Allow camera access the first time. If scanning fails, tap Join Session and type the codes.
4. Tap Upload Files and pick photos. Large files upload in chunks and the app offers to resume if the upload breaks.
5. When the photos appear in the Shared Files list on the PC, download them.
6. Tap End Session when everyone has what they need.

PC to phone works the same way, and text such as a URL can go through Share Clipboard.

Who it suits and who it does not

Limits

• 15-minute default sessions, up to 10 devices and about 1 GB per file.
• No end-to-end encryption; anyone with both the session code and the verify code can join.
• Internet is required; the devices do not need to share a Wi-Fi network.
• QR scanning needs camera permission on a freshly installed device.

Details are in the OneSync guide. For an iPhone and a Mac in the same room, AirDrop is better, and for a large folder a cable is better.

Safety habits

• If you used someone else's PC, clear downloaded files, browser history and signed-in accounts.
• Never post share links or session codes in public places such as group chats or social media.
• Check where a received file came from before opening it, and be especially careful with executables.
• Confirm that file count and size match before deleting the originals.
• For important documents, archive with AES encryption and send the password by another channel; see the archive formats guide.

Sources

The numbered links are in the Korean source list above (same URLs): Gmail attachment limits [1], Google Drive file limits [2], Google account storage [3], OneDrive restrictions [4], iCloud storage [5], Microsoft Learn on Outlook attachment limits [6], Telegram FAQ [7], Pixel Help on Quick Share [8], Google blog on Quick Share and AirDrop [9], Apple Support on AirDrop [10], Google Security Blog [11]. Not verified, so no number given: AirDrop and Quick Share file limits, WhatsApp limits, OneDrive free storage and the iCloud per-file limit.

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