[stumped]

cc v4.4.1 amazon store version so updated feb 2019( the store description says)
on a fire HDX tablet.

[ the 4.4.4 1 is correct for sure but with 2 stores on the tablet is is sometimes confusing which store delivered the app , and i thing for historical version I own copies on both stores- so it is just possible that its the google store version if that has the same version number ]

what started to happen was books would not download when CC was connected to content server: after a long press to download the icon would spin a while then I got a message - something like "cannot download [file name ] to device memory " or maybe it said " to device storage...

BUT it was only happening where i had deleted a book from the device and was now trying to get an updated version from content server.

my books go to a download/cc folder. there is no SD card in this device. it has over 1Gb free space. the epub is ~1Mb

when I tried several other books, not previously downloaded, they were all Ok- and appeared immediately. so the connection was good

so I now had 2 books that would not download, plenty of others that would....
troubleshoot steps:
1. stop start CC app. did not help,
2. power cycle device. did not help
3. stop and restart of calibre on PC seemed to resolve it

so I dunno if its the issue about calibre having now to hand off the book to reader app in android, or if it is a side effect of the fix that Kovid recently did to get the content server to always serve the latest version, after a recent edit, and not anything cached..?

the fire tablet is and oldish hdx so probably running OS 5. I can check if that is a factor

its more likely to be in calibre - i.e. CC is asking for a book and calibre content server for some reason is looking to a cache location where it is not present ? [ do to a change Kovid made a few weeks ago, in response to another thread ]

I am not sure how to try to recreate it, or even whether to bother, but I wanted to log it here in case the error message is a clue and I am missign an obvious an explanation.. i could not remember where to find the deviceapp logs of if they would help retrospectively or not.

FYI I think I edited this book yesterday, wanted to update the device version today, but calibre and the PC has only slept, not shut down in the interim

also, I have 2 tablets, I am pretty sure I updated the book on the other tablet yesterday with no issue, with the same workflow: remove from and delete from Moon+ , then delete from CC also, then connect, download....


UPDATE i found debug log - a very long file.. and I found the errors.

i see it is asking for the epub, then saing content server downlaod failed, java.io IOException format does not exist
but I can inspect calibre library and see it! and as I said above, a stop start of calibre fixed it ?. I can see in the same log, the request which then worked to fetch the book.