Importing document is very easy in nuxeo. I hope "import" according to you is uploading files into the Nuxeo.
One direct way to import is through "New" button
Click on New button
Select the file type you want to import
Click on Create button
Another handy way to import is,
Click on Import button
Drag and Drop the files in to the Files block
Click on Import button
A quick method to import files into DAM is,
Drag and Drop the files directly into the Nuxeo Folders or Workspaces.
Find the attached image for more clarification
Hope these handy ways helps you to import. Happy Importing 🙂
