[theengine]

This post is just for information.

Since upgrading my iPhone to IOS 11, I have still been able to read my books in Safari as normal, initially. However, at some point in the next 24 hour period the ability to do this stops. Then, on looking at the website data cache, I see that the reported data size for the downloaded item is 0 bytes. I tried a few ways to fix this, including saving the book as a Reading List item and in Safari advanced setting under Reading List ticking Automatically Save Offline. This did not make any difference.

I phoned Apple this morning who tell me that IOS 11 now automatically clears the cash regularly as a security feature.

They will consider this issue and may come up with something in later IOS versions to resolve it.

Until them, I'll convert the book I'm reading to epub and download in iBooks.

Hope this helps others that may notice this issue.