You will find that the plugin has a Support page which you can view on your site which explains how to unhide a folder:
How to Unhide a Hidden Folder
1. Go to the hidden folder via your cPanel or FTP and remove the file mlpp-hidden.
2. In the Media Library Folders Menu, click the Check for New folders link. This will add the folder back into Media Library Folders.
3. Visit the unhidden folder in Media Library Folders and click the Sync button to add contents of the folder. Before doing this, check to see that there are no thumbnail images in the current folder since these will be regenerated automatically; these usually have file names such as image-name-150×150.jpg, etc.
4. Repeat step 3 for each sub folder.
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This reply was modified 3 years ago by
AlanP57.