Problem with file saving in Voice Dream Reader in iOS 13

I got a problem after installing iOS 13 and the last version of VoiceDream Reader in my iPhone SE.
I use a customized Internet resource to retrieve book in txt format via the Safari extension of Voice Dream.
Everything worked fine until IOS 12.
Now I can still reach the desired site, enter credentials and display the book (however the text is displayed by Safari, and i am listening to iPhone VoiceOver speech, not to the voice included in Voice Dream).
Moreover, I get just the text and a scroll-bar with the number of pages and a percentage. I cannot find any "share icon", nor any other icon or save button, and I have to download the file again if I close the session.
Temporarily, I am using a solution (which is rather unsatisfactory): I locate and download books by stand-alone Safari browser, then I share them with Voice Dream Reader.
Does anyone have the same issue after updating to iOs 13?
Any hint will be greatly appreciated.
Thanks.
Giuliano