I have a hosted feature layer in AGOL with about 20,000 points. When I go to the item's detail page, on the Overview tab, and click on "Enable Attachments", nothing happens. I published the layer with Feature Access capabilities, and Create, Query, Sync, and Update operations allowed. In AGOL I turned on Enable Editing. What am I missing? How can I enable attachments on this layer? Could it be the number of features is causing the change to take a long time?