The current sync logic only allows you to exclude folders from sync. In my case I only want to sync a few folders, but instead of selecting those I have to exclude all the ones I don’t want to sync. And then inevitably I create additional folders or temporary folders that end up synced to mobile devices because I forgot to go back and change the list of excluded folders. This would be very simple if there were an option to only include certain folders instead of only exclude certain folders.
When setting up sync specify whether the list of selected folders should be included or excluded in sync. If set to included then only those folders are synced. Otherwise the current behavior would be the default.
You have to always remember when creating a folder to change the sync configuration if you don’t want it synced.