Certain Android devices do not come preloaded with the ability to access the internal storage.
You need to download a File manager app.
Once you have downloaded it, you can see the files you have created in the iReal Pro folder - including exported audio files and recordings.
 
The file should be saved here:
/storage/emulated/0/Android/data/com.massimobiolcati.irealb/cache
 
When you quit the app, cache gets cleared so we recommend using a file manager app like Solid Explorer or FX file manager, which supports exporting WAV file.
Both these file managers also appear in the Share window (many do not do this) so you can save to your SD card internal storage.
 
Windows-Amazon
For iReal Pro format, Image, MusicXML, midi, Audio (wav, aac) format exports:
A brief message from Windows will confirm your file has been saved in your Windows Downloads folder. Click Show in folder to find the file.
(By default, your Windows Downloads folder might not be syncing to OneDrive. For important files, please copy to OneDrive or have them backed up outside your PC.)
Backup file information (iReal Pro Songs and Playlists)