Samsung Galaxy S24+ photos, contacts, messages or account data will not sync

The checks in more detail

Start with the connection. Check that Wi-Fi or mobile data works by loading a page, and that Data Saver and Battery saving modes do not restrict background data for the sync. Open Settings, Accounts and backup, Manage accounts and choose the account; tap Sync account and look at the items listed and the date of the last sync. Make sure the toggles for the items you want are on, and that Auto sync data is on, which you can check through the three dots in the account list.

Tap Sync now to force a refresh and watch for an error. If the sync fails, restart the phone, and check the date and time are set automatically. Sign out of the account and sign in again: remove the account from the phone, which does not delete the data in the cloud, restart and add it back with the correct password. For a Samsung account, sign in at account.samsung.com on a computer to check that the account is active and that its password is current.

For a Google account, check the storage at one.google.com, since a full account stops syncing photos and Gmail. Clear the cache and data of the Google Play services or Samsung Cloud carefully, only after a backup, and update Android and the apps. Remove battery optimization for the sync services in Settings, Battery and device care. If one app only will not sync, check the app's own account settings. Contact Samsung with the model and the account if the problem persists.