Use SynCore on all your devices.

• How SynCore Sync works: changes you make are sent a few seconds after you save, and changes in the cloud usually arrive within a minute. Big files go straight to your cloud’s storage, up to your plan’s limit per file.
• Nothing is overwritten without a copy. If a file changed on two devices, both versions are kept: one gets “conflicted copy”, the device and the date in its name. If a file was deleted on one device and changed on another, the changed file is kept.
• Deleting a file in the folder moves it to the cloud’s trash, where you can restore it. If a round would delete many files at once, the app stops and asks before deleting anything.
• In this beta, the whole cloud is synced into one folder, and every file is downloaded to your computer. It works best for folders of up to a few tens of thousands of files. You need access to the whole cloud, as its owner or with full access.

• The apps aren’t code-signed yet, so your system warns you when you install them. On Windows, SmartScreen may say “Windows protected your PC”: choose “More info”, then “Run anyway”. On Android, allow your browser to install apps when it asks, then install. Google Play Protect may offer to scan the app first, because it isn’t from Google Play. Only do this for files downloaded from this page whose checksum matches the list below.
• Mac: there’s no Mac version yet. On a Mac, use the browser app, or rclone with our automatic sync guide.
• iPhone and iPad: there’s no app for iPhone or iPad. Install SynCore from Safari as described below, or use PhotoSync.
• The apps are open source under the MIT licence. Their source code is in the list below.

• The installed app is the same SynCore you use in the browser, with the same sign-in and the same files. It updates itself.
• It needs an internet connection to show and open your files. Without one, it shows a page saying you’re offline.
• In the installed app, big uploads carry on from where they stopped when you reopen SynCore. In Chrome and Edge on a computer they carry on by themselves; elsewhere you choose the same file again. On phones, keep SynCore open until a big upload finishes: your phone’s system pauses web apps in the background.
• While files are being sent, a line at the top says how many are left and roughly how long it will take. You can ask to be told when they’ve finished.

• A separate app password for each device. Your account password is never typed into an app. If you lose a device, remove it in your account and it stops working straight away. If you use two-step sign-in, you confirm each new device with your code.
• Up to 5 GB per file from apps that send big files in pieces, such as rclone. Other apps, including File Explorer and Finder, can send up to 100 MB per file. Bigger files go through the website or the installed app, which take files up to your plan’s limit.
• Files are copied when you or your app copy them. For automatic sync, see below.
• Deleting a file from a device moves it to the cloud’s trash, and replacing a file keeps the earlier version, just like on the website.
• Windows File Explorer only downloads files up to 50 MB unless its settings are changed. For bigger files, use the website, rclone or Cyberduck.

Step-by-step guides for each system are in your account, next to the button that creates the app password.