An edit can look finished in a large preview and still fail on a phone. Buttons, captions and interface elements compete for the same narrow screen. Use a repeatable export check instead of trusting the timeline preview alone.
Frame for the phone
Start with a vertical composition when the destination is Reels. Put the subject and the main action where they remain legible after the app adds its interface. Avoid placing essential labels at the very bottom or near the far edges. If a horizontal shot must be reused, reframe each shot deliberately instead of applying one crop to the whole sequence.
Check the first seconds
The opening should show what the video is about before it asks the viewer to stay. A striking image is useful only when it leads to the promised idea. If the first sentence is introductory filler, test moving the useful answer earlier.
Read captions at playback speed
Correct names, numbers and terminology manually. Keep lines short enough to scan while watching the subject. Contrast and placement matter more than animation. Check the captions against the actual spoken audio, especially after a late cut changes timing.
Listen on ordinary speakers
Play the export on a phone speaker and headphones. The voice should remain understandable when the music enters. Listen for clicks at cuts, sudden changes in room tone and sound effects that pull attention away from the message.
Review the uploaded result
Export a test, upload it privately when possible, and inspect the platform version. Compression and interface overlays can change what the viewer sees. Save the project and clean master so future revisions do not depend on a downloaded social copy.
This checklist is deliberately simple: if the story, text and sound survive a small screen, the edit is much closer to ready. See the editing portfolio for finished vertical work.