If you'd like to delete a photo or any item from a Craft document:

• In a Mac, Windows or Web App: Select the block where the item is and press the delete or erase key. You can select multiple blocks at once by holding shift key or dragging your cursor across the items you want to delete. 

• On an iPhone or iPad: Long tap the block where the item is and press delete. You can also select multiple items by long tapping once and then selecting all blocks you'd like to delete.