If you exceed the 2000 letter limit italki won't post your notebook entry. Also if you want to upload a picture then check if it is not more then 2 Megabyte big. There is also a bug about the letter limit. if you wrote so much that you exactly reached the 2000 letter limit italki won't let you post the notebook entry. So there also have to be the number 1 under your notebook entry so that it sais that 1 letter is still writeable. So at all the limit is 1999. I hope I was able to express myself well. Sometimes italki is also a little slow so wait a little. If you get an error message then try to send it again this helps mostly. If it still doesn't work I suggest you save the text in a word document and try to post the notebook entry later.

If your entries are long, split them into two or three entries ...(1) ... (2) continued ...(3) final 老鬼