I have seen this topic on the forum but am not sure if a solution was given. The only file I am trying to sync is a 253MB LR catalogue. I am using a PC. I can initially upload the file by signing into my cloud account, but when I drop an updated cat file into my PC cloud file location I get the error. If i delete the file from my cloud account, I can upload the file again. Any ideas please?
I've been getting this problem too. I have no solution. I contacted Adobe Support but they said they don't deal with this and to go to the Discussion Forums.