Is it possible to add an Html page as a web part inside SharePoint.
I want this html page to have rows of links that once clicked, it would bring users to specific folder inside a Document Library on SharePoint.
If you are using Classic experience then you can use Content Editor web part to add HTML file to SharePoint Page.
You can enable adding scripts(content editor web part) from Office 365 Admin Portal.
You can add hyperlinks inside your html code like given below:
<a href="siteUrl/DocumentLibrary/Folder1" target="_blank"> Folder1 </a>
You can also use Promoted Links list in SharePoint.