Did you set to send scanned images only when the mobile device is connected to Wi-Fi?
When [Only send and receive data when connected to Wi-Fi] is set to on in ScanSnap Home ( → [Settings] → [Network settings]), data can be sent only when the mobile device is connected to Wi-Fi.
If Wi-Fi connectivity is not available, sending scanned images is suspended. When the mobile device is connected to Wi-Fi, the images are automatically sent to the cloud service.
If the sending status of scanned images does not change even after the mobile device is connected to Wi-Fi, wait for a while with ScanSnap Home started.
Is the mobile device displaying a screen other than the ScanSnap Home screen?
When the mobile device is displaying a screen other than the ScanSnap Home screen, the sending and receiving of scanned images is put on hold.
Wait for a while with the ScanSnap Home screen displayed.
If the sending status of scanned images is [Processing] or [Receiving], wait for a while with ScanSnap Home screen displayed.
Is the mobile device connected to the ScanSnap using ScanSnap Go?
When connected using ScanSnap Go, sending scanned images is suspended until the mobile device is disconnected from the ScanSnap and connected to the Internet.
Tap at the top of the ScanSnap Home screen on the mobile device to disconnect the mobile device from the ScanSnap. After disconnecting, connect the mobile device to the Internet and verify that scanned images are sent.