Android makes this easier than iPhone. Downloads from the browser drop straight into your /Download folder by default, and most gallery apps pick them up automatically. Here's the exact flow.
Step 1 — Grab the tweet link
In the X app, tap the Share icon under the tweet → Copy link. Or open the tweet in Chrome, hold the URL bar, and tap Copy. Either works.
Step 2 — Paste on TwitDownloader
Open this site in Chrome, Firefox, Samsung Internet, or any browser. Long-press the input box → Paste. Tap Download.
Step 3 — Pick HD and save
Tap the HD button. Chrome shows a download notification. The MP4 lands in /Download by default. Open the Files (or My Files) app, head to Downloads, and your video is there. Most gallery apps (Google Photos, Samsung Gallery) auto-index it within a minute.
Save to Gallery instead of /Download
If you want the file in your Gallery directly: after download, long-press the file in Files → Move → choose Movies or DCIM/Camera. Or share to Google Photos and use the upload option to bring it into your library.
Want audio or images instead?
The Twitter to MP3 tool handles audio extraction. The image downloader grabs full-size photos. The GIF tool saves the MP4 that Twitter uses for GIFs.