Linking Dropbox to Speechify makes it easy to breeze through documents and PDFs.
Open the Speechify app
Tap the plus "+ Add" option
Under the "Import PDFs and more" section, tap on "More Import Options"
Select Dropbox. If you have the Dropbox App on your device, you will be asked to sign in if you haven't yet.
Allow Speechify to access your files and folders in your Dropbox
Add the desired file and the App will read it for you
The next time you select "Import Files", it will automatically show your connection to Dropbox