It's really simple. Upload your research papers' PDF file by clicking the upload button. Wait for it to finish loading, and then you can start playing the TTS back to you. The read text is highlighted on the screen, which should help you focus if need be. You can pause the TTS whenever and highlight your PDF. You can also speed it up and slow it down. And maybe change the voice (still working on this). Lastly, you can redownload the PDF whenever you feel like it, and this time, it will bring the highlighted text along with it. I use browser caching so that you don't have to log in but won't lose your place in the audio file, even if the website refreshes. I also allow for background play, so if you're listening on your phone, you can lock it or use other apps while listening. Hope this clears things up, and if it doesn't, contact me through the contact form and I'll get back to you.