How to customize the theme images. Click the customize button at the top and then select the section in which the image is located after that you will get a left sidebar with customization options select the image customization and then upload the image which you want to replace with, crop your image if required or else you can skip cropping. Now your image is replaced successfully.
Note: We fixed all the image sizes to display imagesfile:///C:/themes/coffee.docx correctly in the theme. Please don’t crop the image. Unless in some cases you want to crop make sure not more than 20px. So, for better results don’t crop the image just select the area of the image by moving.