SPFX webpart not showing in SharePoint site Apps list

https://www.c-sharpcorner.com/article/sharepoint-framework-deploy-spfx-webparts-to-sharepoint-library/

 

After adding .sppkg file to app catalog and deploy files to asset library,now i am trying to add this app into a sharepoint site. But this app doesn't show up there. I am trying hard to identify what went wrong. But i am not able to find out the cause and the solution for this issue.

 

Please help me.