How do I make sure that all my videos are in the cloud? How can I see what’s there?

The easiest way to ensure that all of your photos/videos have uploaded is to compare the number on device and in the cloud.

Go to iCloud.com and select photos. Once the photo app opens you should see a tally of the number of photos and videos in the cloud.

You can compare that with your device:

Go to photos on your device. Select library. And scroll to the bottom. You'll see a similar count or a note indicating that files are uploading.

If you are using iCloud Photos, whatever is in iCloud is also already on your device. If you see it on your phone, it is in iCloud. You can log into iCloud.com on a computer or an iPad and then click on the photos app and see the videos on there.

If you backup with iCloud and include photos and videos in the backup rather than use iCloud photos, you can’t see them in iCloud because you can’t see anything in the backup unless you restore the backup to an iOS device.