Thank you for bringing this to my attention. I apologize for any confusion caused by the current limitations of the button style.
To clarify, the background color feature for the large button style currently only applies when using a file icon or file size. However, I will make sure to include an update in the future to allow for the direct application of background color to the button itself.
In the meantime, you can try using the mid or small button styles, which do allow for the direct application of background color while still hiding the file size and file extension. You can find these options under the “Button Style” section.
Additionally, if you would like to apply background color to the large button now, you can use the following CSS code to manually add it to your WordPress site by going to the “Customize” (under your current theme) section in the backend and selecting “Add additional CSS“. Then paste the below code. Change ‘blue’ to your preferred color.
.qdbn-download-button-inner button { background-color: blue!important; }
I hope this helps.