Starting in version 8 Corkulous supports a wide array of file documents. An icon preview of the document in generated. Simply double tap the icon to view the file.
The formats are supported:
iWork and Microsoft Office documents
Text files of all types
Augmented reality objects that use the USDZ file format (iOS and iPadOS only)
To use the described feature on an iPadOS or macOS device, first extend the shelf on the left side of the screen. On an iPhone, the shelf extends from the bottom instead. Here are the steps to follow:
Accessing the File Item: Tap or long hold and drag on the file item located in the shelf. This will cause the item to animate and move to the center of the canvas, or you may drag it into position.
Add Files: After the blank file item is added to the canvas, a file dialog is raised to select a file.
Files Tips
Creating Similar Items: To quickly create an item similar to one you've just made, use the keyboard shortcut ⇧⌘N.
Connecting Items: To connect items, long-press on an item until it glows. Then, drag a string/connector to another item. Alternatively, select two items and connect them using the pin button in the navigation bar. There's also a setting in the board's settings to choose the type of connections.
Drag and Drop/Pasting Files: Users can add files by dragging and dropping or pasting them. Learn about this for iPadOS from Apple Support.