To import files to Canto that have been shared to an Upload Link (by outside collaborators):

Navigate to Settings, and then select the Links & Connections tab, followed by the Upload Link sub-tab. 

2) Click the Review button next to the Upload Link.

3) The files will be displayed in a new tab. Select the files to import.

4) Drag the files to an album in the Folder and Album structure. All of the selected files will be dragged together. The files must be dragged to an album, not a folder.

A confirmation window will be displayed when the import is complete.