Drag and drop O365 email folders have disappeared

[kennysarmy]

A user opened up their office 365 emails using Chrome.

 

They then opened up a shared mailbox they have access to on another screen (dual monitor setup)

 

They claim they then successfully dragged email folders from their own account to the shared mailbox and all was fine.

 

They are now saying the email folders no longer exist in either.

 

Thoughts?