Error:Error: Invalid file name: must contain only lowercase letters and digits ([a-z0-9_.])

Error:Execution failed for task ':app:mergeDebugResources'.
> C:\Users\Kevin\AndroidStudioProjects\MemeGenerator\app\src\main\res\drawable\living1.JPG: Error: Invalid file name: must contain only lowercase letters and digits ([a-z0-9_.])

Above are the errors I received during my build of this app.  My image is "living1.jpg".  The only thing I can think of is that the background in bottom_picture_fragment.xml says: @drawable/living1

Please help!