iBooks message - iCloud storage full (but isn't)

I had this problem, and may have found a solution.

Before finding this thread, I downloaded a PDF to my iBooks from Dropbox and got the warning "your iCloud is full...blah blah". It added the PDF nonetheless. After checking, it shows I have 171GB of space in my iCloud storage.

After reading this thread, I decided to click on some preferences. I have found most problems we have are in the settings.

I clicked on iBooks(top bar)-Preferences-General(pop up window), then on the bottom there is a box: Reset Dialog Warnings [Reset Warnings].

I clicked it, then downloaded another PDF and I got no warning.

Hope this helps.

That worked for me! And now the document is showing up on my other devices too!

Same problem here, the only difference is that I just have one iCloud account, with 4 GB left, but iBooks keeps telling me "iCloud storage is full"

Same problem for me, the storage for my account is 4.11G, and iBooks told me the storage is full.

Same problem here. 20GB of free space and iBooks is complaining. 😟

Same 171GB free space... so why am i paying for storage that can be used when i actually need to.

Same problem. I'v read somewhere in another thread sometimes, but not always, restart may help. So, it seems to be a bug.

Same issue here running 10.11.5 and 4.38 GB free on iCloud.

Same issue here, restarting didn't help. 137GB free on iCloud and iBooks still complains that I'm out of space and need to upgrade.

same issue here 5 GB free on iCloud. and I need to upload only less than 30 M !!!

I get the same message, 100Gb free, but iBooks prompts me to upgrade due to lack of space.

Same here about 4gb left says I need to delete books and now is loading them to library/yadayada/documents/books/ibooks (sorry can't remember exact path now)

I wonder if only a certain amount is allocated for your own books ? I have a bunch of pdfs and manuals, only have a few bought books. Come on Apple, I don't want to have to use dropbox for eveything.

Similar issue for me: I have one iCloud account, used on a MacBook Pro and an iPad, with iBooks sync switched on, and not much else. When I try to add a 7 MB PDF to iBooks on the MacBook, iBooks says my iCloud store is full. When I go to System Preferences → iCloud → Manage … → iBooks, it says I'm using ~170 MB for iBooks and the available iCloud space is ~3.5 GB. When I delete the PDF from iBooks on the MacBook, send it to the iPad by e-mail, and copy it to the iBooks library there, it uploads to iCloud from the iPad without problems and then syncs to the MacBook. Obviously an issue with iBooks on OS X.

Identical problem as everyone else and confirm what MccoQy said - seems to work from from iOS devices but not OSX.. bug it seems.

I have the same issue, ~41 GB of free space. Please fix this apple.