Method 1 (Recommended)
Open the app or browser with content you want to save
Open the share button for the desired content or long-press until a share option appears.
Navigate to and tap the Savespace icon. Some users may need to open the More …option to access it.
Tap "Add to Library"
Method 2
Copy the desired content
Open Savespace
Tap + of the Library
Tap the "Paste" button
Tap "Add to Library"
Method 3
Open Savespace
Tap + of the Library
Select the desired source (Audio, Camera, Photos, Files)
Select the desired content
Tap "Add to Library"