Zipped (Compressed) files use less storage space and can be transferred faster than uncompressed files. With PDF Reader, you can zip several files into a single folder to share them more easily.
1. Go to the “Documents” tab for the file list
2. Tap the "Edit" button on the top menu until the files are selectable.
3. Then select the file(s) you want to create a zip archive and choose “Zip” from the menu.
4. Then a new zipped file is created in the file list.