A registered folder is not a webserver.
The steps for "Host a custom widget on a web server" will guide your through the setup to enable Portal to access the server. You will need to set up a machine that is configured within your ArcGIS Enterprise.
Hi @MoSaket,
There's no link in your post.
The manifest.json needs to be on a webserver that is a part of your enterprise (i.e. accessible to your portal server via HTTPS).
Hope this helps.
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