Extremely Convenient- a Big Time Saver

I rarely write a full detailed review for an app. However, this app is amazing and deserves a good review. Here, I will point out the strong features of this app. I will also address the issue of the PDF file that has been stated in the previous comments.
High accuracy
Adjustable reading speed
Works with iCloud and Google Drive

AS far as PDF file, the app is capable of reading the PDFs with the text as the main component of the document. For instance, if you convert a webpage to PDF (on your IOS devices) or covert any Word doc to PDF, then the text will remain as the main part of the document.
However, if your PDF file is the mere image of the text, the app will not be able to determine where the actual text is located, which makes sense.

Drre3a about Text to Speech - Speaky