I have followed the Getting Started Guide for building a Jira Cloud app, and I was able to install the functional app into my own Jira Cloud account. It's functional and working great, but I can't figure out how to set the icon in the Jira menu to what I want. For example, here's how it looks now:

The PayPal Invoicing app is what I've added, but it gets this generic icon. I'd rather change that to the PP logo/icon. Any information on where I make this change would be greatly appreciated. Thanks!