A client has Google Mail on their Mac Mail app. All their emails have been stored within folders in the "On My Mac" section, so the emails were being removed from the Google mailbox. The mailbox is 11GB. Their internet connection is around 40/20Mb.
They now want their emails put back on Google Mail.
The client had started to move some of the 100+ folders themselves, but noticed that the message count would first appear to be correct, but then it would lose about 15 emails or so in every folder.
That issue seemed to have resolved itself, so now we tried to copy all 100+ folders over to Google, but then it says an error that a folder already exists and it stops. This is odd as previously, it seemed to just merge existing folders. So now I'm trying one folder at a time. Mac Mail shows that the emails are on Google, but when I go to Google Mail on the browser and check the folder, it is empty.
Is there a better way to migrate the emails? We've spent 4+ hours on this already and Apple were unable to help with it.
Edit: This is a nightmare! After copying all the folders again, Google place all the emails in the "Drafts" folder on Google mail, but on Mac Mail, it doesn't show them there at all.