1. Tap the "Edit" pen icon at the bottom right of the file library and you will see a check box listed in front of each file/folder.
2. Find the particular file/folder you would like to manage and tap the check box next to them.
3. You will see options including Share via, Open in, Delete, Rename, Copy to folder, Move to folder, Zip, Merge (for 2 or more documents), and Select All.