Your screenshots are from two different pieces of software.
Confluence Cloud and Confluence Server do not have the same app framework. Server apps cannot be installed on Cloud, and Cloud apps cannot be installed on Server.
Your first screenshot is from Cloud, your second is from Server.
Assuming your target system is Cloud, as per first screenshot, then what you have to do is forget the upload, identify (or write) a Cloud app that provides similar functions to whatever the server app was supposed to do, and install that.
Hi Community! We're thrilled to share that Team Calendars for Confluence is now a built-in feature for Confluence Data Center releases 7.11 and beyond. A long time favorite, Team Cale...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events