How to sort photos in a collection ?

[SpookiePower]

I have created a collection and added some photos to this collection.
Now I want to sort the photos, the way I like it, but I can't. Can someone
help me ?

 

[Victoria Bampton]

It's a drag/drop job - but make sure you're picking the pictures up by the middle of the thumbnail, not the area surrounding it. As you drag the thumbnail to a new location, you'll see a black line appear between the thumbnails below to show where it's going to drop.