After posting your own video on X, check the published version against the recording you meant to upload. A successful post does not tell you whether you selected the final edit, left the correct closing frame, or included the right audio track. A short comparison can catch those mistakes while the project is still open.
Name the two versions before comparing
Keep your exported master in one folder and the saved public copy in another. Give them distinct filenames, such as demo-final-export.mp4 and demo-posted-copy.mp4. Do not overwrite the master with the platform copy. If you exported several cuts, verify which filename you actually uploaded before drawing conclusions about platform processing.
I maintain Twitter Viewer. The twitter video downloader can retrieve an available MP4 of a native video in your public post. Paste that post's URL, confirm the preview, and save a copy for the comparison. This copy represents an available platform version, not your original editing project.
Check the edit before judging image quality
Play the opening of both files. Confirm that the same shot and first spoken sentence appear. Then jump to the end and check the final instruction, credit, or call to action. A missing ending can be an export-range mistake or the wrong file, so look at your master before blaming the post.
For a tutorial, inspect the point where a new step begins. A small earlier trim may shift every later timestamp even when most of the footage looks identical. If you attached a transcript or step list, test its time references against the published copy rather than assuming they still line up.
Listen to the sections that establish meaning
Compare an introduction with speech, a quiet section, and any point where music or a second speaker enters. Use a consistent listening volume and check the player's mute setting first. If the master already has an imbalance or missing voice, downloading another variant cannot supply the absent recording.
Watch a spoken word with a clear mouth movement or a visible button press with a click sound. If timing appears wrong, repeat that moment in another player to distinguish a local playback issue from a problem in the files. Write down the file and elapsed time where you observed it.
Record a specific correction
Use a concrete issue description: posted copy starts with the draft title card, or final five seconds are missing from both files. Keep the comparison notes in your project until the correction is finished. When you replace or repost a video, revisit any linked transcript, example code, or written instructions so they describe the new version.