iMovie library not showing videos

You probably need to download the videos before iMovie will recognize them.

Try downloading your videos to your physical Photos app library. Then access them in iMovie from the Photos item in the iMovie project media sidebar. For that to work, your Photos app library must be designated as the system photos library in the Photos app General preferences.

-- Rich

With iCloud photos there will be some videos and photos that are stored in the cloud with only thumbnails in the Photos app library. Other files will remain on the hard drive. The ones in the cloud won't be recognized by iMovie and would need first to be downloaded from the Cloud to the Photos library. Possibly that explains why some of your videos do not show up. Also, with the Monterey OS and Photos 7, it seems that the option to drag directly from the Photos app into iMovie is gone, and only a photo clip of a video will appear. Up to now at least, the solution has been to drag the videos from the Photos item in the iMovie project sidebar.

So, not sure what is going on in your situation. You might try contacting Apple Support.  The techs there have the capability of remotely accessing your computer that we cannot do here.  To contact apple support click on the Get Support item in the upper right hand corner of this forum’s screen.  Navigate to a place where you can enter your phone number.

-- Rich

I have the same problem. I have a 2021 M1 iMac and iMovie will not see most of the videos I have in Photos. I have updated all software. As a workaround, I exported videos to my Desktop and then iMovie can import them from there. I don't recall having this issue in the past on other Macs. I got it to work but there must be a better way.

Others have reported the same issue as well. It might be something that Apple will need to address. Meanwhile, importing from the desktop is a viable workaround, although a tad inconvenient.

-- Rich

The same thing is happening to me. Even when I drag and drop a video from the photo app into my timeline it transforms into a still.