How to combine PDF files:
1. In the PDF NOW app on your iphone or ipad, click the "Mergeā button.
2. Choose the PDFs you want to combine from your device. Or you can download from your Google Drive and Dropbox before step 1.
3. Click the "Merge" button in the bottom. You can reorder them.
4. Click the "Start" button and the tool will automatically merge your PDFs into one PDF. It's an alternative freeware app