Follow the given procedure to upload folders:
Select the Collection from the drop-down present at the top left-hand side of the action bar to view the folders and files under the Collection.
Once the menu opens up, click Upload Folder menu item. The following pop-up screen will appear,
If Turbo is not installed then click [Install Turbo] button to install the app. If it is already installed then click [Upload with Turbo]. The Upload Files dialog box appears.
Use the “Browse Folder” button to find the folder you want to add to the archive.
Be sure to click the “Include files from sub-directories” checkbox to include all the files and folders under the target folder.
If the upload includes 'Small Format' files that need to be text searchable in the archive, make sure the “Allow file content search” box is checked. If not, uncheck it.
Click the “Start Upload” button to begin the upload. The confirmation message appears after successful uploading.
The Turbo Upload allows bulk upload of multiple folders and with its contents within the application.
Links:
Accessing & Understanding Collection Folder & File Screen