Yes, ZenLedger does save your progress as you work in your account. You can upload some transactions now, then return later to upload others and everything will be saved automatically. There is no “save” button you need to worry about clicking before logging out of your account. This includes not only data that you import, but also any manual work that you do in your account. It will all automatically be saved as you go along.
If you are wondering why you have made changes but they are not being reflected in your Tax Reports, we recommend checking our article on How To Run Fresh Tax Reports!