Welcome to the Lightroom Community. I'll help you figure this out. What version of Lightroom Classic & the specific android device you're working on?
Try using Export As & export the image by manually selecting the options in the Export As menu.
Try keeping the device in Flight Mode & without internet when you launch Lightroom & then try using Lightroom. If this does not help, please back up all your Lightroom images before proceeding further.
Let me know how it goes. Thanks!