Maybe accidentally& or maybe by choice and forgotten later on. It is possible that for some reason& it is not the case without your knowledge. The first reason assumed that you had Backup and Sync enabled for Google Photos. Reason 2: Backup and Sync Disabled or Paused Although& sync can take up to 48 hours to sync your media depending on size and usage patterns. Sleep through the night and come back to a fully synced library. The best way to do this is at night if you cannot leave your devices unattended throughout the day due to frequent use. Otherwise& they might run slower and in the background with low priority to not affect user experience with other apps and the system. Solution: Leaving the device on the charger and unattended will help speed this up if this is what is going on since scanning processes are generally set such that they are prioritized and function majorly when the device is connected to power and unattended so that the device battery along with the user experience is preserved.

It can be unnerving and frustrating& but it happens& and that is how tech is today. It is possible that Google is simply scanning the library at the moment& and you should see that changes are synced across in a while. Google Photos today is a multidimensional tool that uses sophisticated artificial intelligence to bring you the wizardry it does& such as recognizing faces& objects& and even places and grouping them for your convenience. Reason 5: Google Photos Not Using Data Connection.Reason 2: Backup and Sync Disabled or Paused.It uses the Backup and Sync app on both PC and Mac desktops and uses the built-in Google Photos app on Android smartphones and the downloadable Google Photos app on iOS devices.

Google Photos operates from your desktop and your phone. Part 1 Google Photos Not Uploading: Why Are My Photos Not Uploading To Google Photos?

Dropbox app not uploading photos