How to update folder's name and/or picture?

From the folder page, tap on the arrow in the blue circle to get into the folder's content.

Tap on the folder icon, located at the top center of the screen to get into the folder edit page.

Change the folder' names and/or picture  then click on the button on the top left to come back to the previous screen.

Your folder's name and/or picture will be updated automatically.