In SharePoint online we are able to deploy the app on to the developer website using Visual studio, however we want to add the app in app catalog for installing the app in Team site, Project site, community site, etc.SharePoint-2013-Hosting

Follow the below steps to upload a .app file in app catalog.
1. Go the admin Portal in your SharePoint on-line Tenant.
2. On the Left navigation click on the “apps” to go to app catalog

3. On the Apps page select the “App Catalog” look like the below picture

4. Then you will be navigated to the app catalog site.


If you haven’t created the app catalog site before, it will ask you to create new app catalog. Provide the app catalog name and on clicking ok the app catalog site will be created.

5. Now, click on the “Apps for SharePoint” as shown on the following picture:


6. On the “AppCatalog” library you can upload the file using upload option.

7. Now, choose the file click ok to upload the file,


Finally your app will be successfully uploaded in app catalog library.

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