Greetings, Human_Brachiator.
I see that you're unable to save the original video you've edited using the Photos application on your iPhone. You're only presented with the option to "Save as New Clip", and I'm happy to help.
How to edit videos on your iPhone, iPad, iPod touch or Mac -- That feature was removed with an explanation.
- Open the Photos app and tap the video that you want to edit.
- Tap Edit.
- Move the sliders on both sides of the video timeline to change the start and stop times.
- To preview your video, tap
.
- Tap Done, then tap Save as New Clip.
Photos on your iPhone, iPad, and iPod touch saves your edits as a new video so that you can use the long or short version whenever you like.
Take care!