If you want to install the web part for modern pages, follow the steps below
Requirements:
- SharePoint Online
- The app catalogue configured for the tenant or the site collection
1# Upload to the app catalog
- Login to your Office 365 admin center page with an administrator account;
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Open the app launcher and click on Admin;
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Open your SharePoint Admin Center;
If you can’t find the apps button, look for add-ins.
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On the left pane, click on apps and then App Catalog;
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Inside, on the left pane, click on Apps for SharePoint;
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Now click on Upload and upload the .sppkg file that's inside the spfx folder in your web part package;
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Finally, on the pop up that appears, tick the checkbox and click deploy;
And that's it! The web part is now ready to be used.
Next - Configuration