Check to make sure your OneDrive is synced and connected. This can be known if the icon is a blue cloud.
If the blue cloud does not show in the taskbar, click on the up arrow to open a tray with more icons visible.
When not within Wi-Fi or network range, OneDrive will pause syncing. It will also pause sync on a metered network such as hotspot. A pause icon will be next to the blue cloud if syncing was paused.