: Open the Photos app, select your clips, and use the "Memory" feature or the free iMovie app to "Create Movie." 2. Using Free Online Tools

: Use the "Merge Video" quick action to drag and drop your VID-20220703-WA0071.mp4 and other assets to combine them into one file. 3. Mobile Apps for Advanced Editing

: Save the final "put together" version to your device as a new MP4 file.

: Trim the ends of clips if they are too long or add transitions between them.

If you prefer working on a computer or want more editing control, several free web-based platforms can merge MP4 files quickly: