Some useful information in these links. Thanks.
I tried the process described in the first link on Ipad2 (I
explained above what I mean by iPad2). It worked. All the PDFs deleted by the last
backup reappeared on this iPad. There were 24 of these and I had e-mailed them
all to myself as a safeguard before exposing iPad2 to any testing.
I then tried the same procedure on my wife’s iPad where
hundreds of PDFs have vanished. This time my wife’s missing PDFs did not
reappear, but the PDFs that disappeared and reappeared on iPad 2 were added to
her iPad. Both use the same Apple ID.
I tried the alternative suggestions in the second link, but
nothing brings back the remaining PDFs.
What I cannot understand is why I can’t see on iCloud the
PDFs that disappeared from iPad2 and then were restored to both iPads, let
alone the others. Can anyone tell me how to do this?
On both iPads. iCloud -> Manage storage shows 322.4MB
assigned to Apple Books. I’m pretty sure that 24 PDFs that I can still access
don’t make up this total - the largest is 48Mb, but the next largest is 5MB.
Some are a single page. Most of my wife’s would also be a single page, so I
suspect the 322MB relates to all the PDFs I’m trying to restore.
It seems like lots of people are having similar problems. It
really gives me no faith in Apple software. Any more suggestions would be
helpful thanks.