Android devices have a limit on image size, at a certain point it will start to degrade the image so it can still be displayed without running out of memory.
For optimum image quality, designs should not exceed 2000 pixels in length. Find out about recommended image sizes here.
You can turn off our Memory limitation check by going to Settings on the app.
How to change memory limitation:
Settings -> Optimize Image Sizes -> (Turn this off)
Note: On older devices this may cause performance issues.