Android
File / Folder Sync
With a file sync client, files can be automatically synchronized between the Cloud server and your devices.
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Go to the Google Play Store, and install the Nextcloud app for Android.
Nextcloud Mobile Client in the Google Play Store -
Open the app, and click the Log in button.
Click the “Log in” Button -
Enter the Cloud server address:
https://cloud.w3ctag.org/.
Specify the Cloud Server URL -
Connect to your account by clicking the Log in button.
Connect to Your Cloud Server Account -
If prompted, enter the following information and click the Log in button.
Name Value Username or Email address Your W3C TAG username or email address, e.g. sarah or sarah@w3ctag.org Password Your regular W3C TAG account password (not your app password for this Android device) 
Enter Your Account Credentials -
if you’ve enabled 2FA for your account, you’ll also be prompted for your TOTP:
Enter the TOTP -
Click the Grant access button to grant the sync app access to your cloud account.
Authorize the Sync App -
The Nextcloud app requires access to file storage on your Android device. Click Allow to continue.
Connect to the Cloud Server -
You now have online access to files in your cloud account.
Access to Files on Your Cloud Account
Because mobile devices have limited storage, files aren’t synced for offline access by default. However, you can configure which files/folders you wish to have synced, along with many other options.
Calendar, Tasks, and Contacts Sync
Android devices do not offer native CalDAV or CardDAV support at this time, but you can add secure and reliable two-way sync of calendars, tasks, and contacts with a third-party app such as:
DAVx⁵ CalDAV/CardDAV for Android lets you manage and synchronize address books, calendars, and task lists with a single app. Works with your favorite calendar and contacts app.
To set up calendar or contacts synchronization using DAVx⁵ on Android:
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Tap the add (+) button to add a new CardDAV/CalDAV account.
Add a New CardDAV/CalDAV Account -
Select Login with email address, and enter the following information:
Name Value Email address Your W3C TAG email address, e.g. sarah@w3ctag.org Password Your app password for this Android device (not your regular W3C TAG account password) 
Login with Email Address Tap LOGIN. DAVx⁵ will query the base URL from your email address for both CalDAV and CardDAV, and use whatever it finds.
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Account name defaults to your email address, but it can be whatever you like. Click CREATE ACCOUNT
Tap “Other” -
Tap on your newly-created account to view and select available address books and calendars to sync.
Tap on “Account” -
Tap the CARDDAV tab, and select the address book(s) you wish to sync.
In the example below, there is one available address book on the Cloud server called “Contacts”
List of Available Cloud Server Address Books -
Tap the CALDAV tab, and select the calendar(s) you wish to sync.
In the example below, there is one available calendar on the Cloud server called “Personal”. You may see additional calendars available for synchronizing (e.g. “Birthdays”, “Holidays”, etc.)
List of Available Cloud Server Calendars -
Tap the back arrow at the top-left to return to the main screen.
DAVx⁵ will run in the background and automatically sync contacts, calendar items and tasks between your device and your Cloud server account.
Help & Support
For more information about the DAVx⁵ sync client, please see the DAVx⁵ User Manual.