I've been having an issue with adding a manual activity on Garmin Connect for a week now. It doesn't give me any error, I can still go into my Activities page, but when I try to click on '+ Manual Activity' nothing happens... Also, I synced my device, however, Garmin connect doesn't show any activity for the past week, but shows today's steps... It's super strange. I've never had these issues before ever since I got my vivofit in August. Please, help me because I have no clue what to do and I don't want to lose my stats. Thank you in advance.
I am sorry about the trouble creating manual activities. I have created a case on this yesterday and I hope to see this issue resolved soon. In the meantime, you should be able to create a manual activities using Classic Connect as uraudi stated.