Having problems trying to make template my own

Hello I’m having issues trying to make an app that I downloaded my own. It’s a Client portal for my clients and my web developers but every time I try to upload the spreadsheet css spreadsheet to update my roles and etc nothing happens. I want to integrate with my google sheets so it will update automatically could someone please help thanks.

Do you mean when you try to connect your app to a spreadsheet, nothing happens? Can you record a video using Loom?