Mobile App Icon | "Add To Homescreen"

This is minor, as example, when I save my Upmind Admin login, or a client login to there phone our icon is distorted my app is '“XARRVO” are we able to have a spot under branding which is specifically for adding this app icon image, which can be in high quality, as well as an option for clients who manage from there phone to install the app by “Saving to homescreen”. It works extremely well on mobile, but looks unprofessional when saving.