You can use colored labels for files and folders for easier indexing. Admin level users can customize the labels by changing the text and color associated with each label.
Assign label to a file or folder (method 1)
Click the Context menu below the file/folder thumbnail. Choose Label change.
Now choose the label you want to use from the modal popup window.
Assign label to a file or folder (method 2)
You can also change label on a file, from the large preview view. Click on the file to open the file in the preview mode, then click on the label status in the lower left corner.
Choose the label you want to use in the modal popup window.
Assign label to multiple files and folders
Navigate to the folder where your files are in, then click on the Bulk action icon in the top navigation menu and choose Label change. Now select all the files and folders you want to edit. Then press the Change label button.