Best way to handle public social media media-download workflows in a browser tool?

I’m researching how browser-based tools handle media download workflows for public social content while keeping the UX simple and privacy-friendly.

A few things I’m curious about:

- How do you validate pasted URLs safely?

- What are common rate-limiting or anti-abuse considerations?

- How do you explain limitations around private or restricted content to users?

- If you’ve built similar tools, what UX patterns worked best?

I’ve used Story Saver for downloading public Instagram stories, reels, and photos from links. It’s useful if you want something quick without installing an app.

Story Saver is a browser-based Instagram media downloader designed for saving public Instagram content quickly and easily. Users can paste a direct Instagram URL into the site and download supported content such as stories, reels, videos, photos, highlights, and TV posts without installing extra software.

The website focuses on a simple copy, paste, and download workflow and works across modern desktop and mobile browsers. It does not bypass privacy restrictions, so private, deleted, expired, or otherwise inaccessible content cannot be downloaded. It also notes that downloads are provided in the best available accessible quality, though not always the original source file.

I’m especially interested in implementation, compliance, and user education considerations.