Which version of Lightroom Mobile and Android are you using? Are you using the app through a subscription, or were you using a free trial? If you have a subscription, please go tolightroom.adobe.comto check if you can find the images there. Also, please ensure you are signed in to the app using the correct email ID.
Did you recently update or re-install the application? Don't you see any images in Lightroom now?
If you are using the free version of Lightroom mobile, please try restarting the mobile phone to check if that helps.
You can try connecting your phone to the computer and navigating to the Lightroom folder on the internal storage to check if you can locate any images. You can also check the com.adobe.lrmobile folder in the internal storage of the Phone > Android > Data > com.adobe.lrmobile > files and check if you can locate the images there.