Differences between building a page in Groups vs Flagship
Unlike Flagship, when you create a page in groups, you need to save the page immediately. This allows the page to be related to your group, so when you add images, they get associated with your group.
Updating a Group Content Title and/or URL
You can update the URL by changing the page Title and SEO title, then go to your content list and edit the relation. To do this, find your page in the content list, go to the operations column, and go to "Edit Relation". The "Edit Relation" page may look blank, save it, and it will update the URL. The changes may take approximately 30 minutes.