I started using NOTES recently and was surprised to see that after saving my notes and reopening them later, most of the information had not been saved and I had to start over, trying to remember what I had written. I tried it again and again, only to find that most of the time, clicking 'Save' or 'Save and Close' doesn't do anything. Then I came to this forum and found that similar questions from 5 years ago had not been answered.
By the way, it should save automatically. You shouldn't have to remember to click 'Save'. But when you do click 'Save', it should save. But it's not saving.