editing digitized vhs in iMovie

Update: "Maybe" I've messed up by importing the digitized video straight into iMovie from my thumb drive — without putting the file in Photos first?

When I select a short clip in the main movie and try to share it, iMovie wants to share the entire movie... in this case, 25 minutes. When I click on the 'i' info button near the upper right, it clearly shows me the 34.3 seconds of the selected clip.

But, Apple says: "Clips in iMovie link to source media files on your Mac or a storage device. When you modify a clip, you are not modifying the media file, just the clip’s information in iMovie. (This is known as nondestructive editing.)"

Does this mean I have to have a source file in Photos, to allow a clip to be shared? This should be simpler...

Thanks, Rich.

I just tried it... and it is pretty clunky — but works. Is there other software that would be more efficient?

I LIKE the simplicity of pressing "play" on an old video and pressing "record" on the digital capture device and walking away till it's done... but now I'm thinking it would be better in the L-O-N-G run to sit there and put physical breaks in the digital recording, creating perhaps 10-20 separate files of the 10-20 events on the original analog tape.

Now I see why Mick Jagger has no interest in sitting down and doing a biography or autobiography. Every hour of old media is stealing at least an hour from my present and future life. With editing, that increases exponentially. The reward is that it brings joy to myself and others.