webpages in sharepoint.

Mark_lefler Any particular reason you are trying to upload custom web page on SharePoint site?

 

You can create your own pages in SharePoint sites and use SharePoint out of the box web parts or custom web parts as per your requirements.

 

Check these documentations:

1. Create and use modern pages on a SharePoint site 
2. Using web parts on SharePoint pages 

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Hello Mark_lefler 

 

a page is an element from a site, they will be stored in the SitePages Library on a site 

 

Here are more information from Gregory Zelfond  about the differents:

https://sharepointmaven.com/sites-vs-pages-in-sharepoint/

 

Best, Dave