How to record mouse movement? Video not triggering

Hello. I need to see the wanderings of a mouse that is visiting indoors almost every night eating from a bag of flour and avoiding our traps. I spotted the critter in the 30 second snapshots but video recording didn’t activate even though I set motion sensitivity on high for our Stickup Cam I bought last week. Is this device incapable of detecting mice movements? Three Snapshots attached where the sneaky little rodent can be spotted.