After creating your CutList Plus project on your computer, choose "Export for Mobile" from the File menu. This will save a copy of your project on your hard drive, specially formatted for your iPad. It will have a file extension of "icxp". Make sure you select your Dropbox folder to save the exported file in.
The file you exported on your PC will be listed in Dropbox. Tap it to select.
The "three dots" button is used to access the Export feature in Dropbox.
The "Export" button will access the "Open In..." options.
The "Open In" button will bring up a list of apps, including the CutList Plus Viewer.
Tap the CutList Plus button to launch the CutList Plus app with your project file.