Most devices include a native text-to-speech feature that can read your ebook aloud to you. Using this feature within Copia will require the reader to select the desired text (up to one whole page at a time).
If you select text using your mouse or finger, a toolbar will pop up in your ebook.
On the web reader it looks like this:
In the apps, it looks like this:
Click the Read Aloud button (web reader) or the megaphone icon (apps) to have your device read the selected text aloud.