Kiddom allows you to "stash" or save content without assigning while you are browsing the Library. You can then access this content when you are ready to assign it.
Open the Kiddom App on your iOS device
Log into your account
Click "Content Library"
Click the heart logo next to any content you want to save.
Click the three lines on the top left to access your options panel.
Click "My Content" to view your saved content