Enter all the desired criteria: the apps that satisfy them all will be searched; if a criterion is specified multiple times, only the last occurrence will be considered.
For example, this is the screen it opens if you decide to choose the "JOIN PDF FILES" option. From here with a few clicks you can add the pdf documents you need to merge. You can insert them with a simple "drag and drop", or you can select them from your pc, or even from your Dropbox or Google drive accounts.
The following figure shows how to use the tool to join 2 PDF files.
Now just click on "MERGE THE FILES"
All the pdf pages will open together and it will be possible to invert the pages too.
Finally, once the documents are merged, they can be downloaded, mailed, printed or automatically added to Google drive or Dropbox. 
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