part missing timeline

[mac2thefuture]

Hello guys, please note the pic. I'm not an expert and worked on this project to completion last night (approx 5hrs worth of time spent ion it). I closed the lid on the MacBook Pro last night - on opening this morning the first 4 / 5 video clips are missing. How can I restore them? Thanks

 

[mac2thefuture]

In addition, although a preview appears here - some of the thumbnails will not play???

 

[joema2]

In addition, although a preview appears here - some of the thumbnails will not play???

Were the clips imported from an SD card and maybe the card was removed before the import finished? See this video: