Hi,
I have created a sandbox Solution with Visual Webpart in it and then deployed it on sharepoint online , it works fine but when i change something in visual webpart and then deploy the solution online , my site takes older version of Visual Webpart and does not reflect changes and also there is upgrade solution tab in solutions gallery but it is either disabled or shows that User does not have appropriate permissions.
please tell me how to upgrade my solution on sharepoint 2013 office 365 online.
thanks,
Gaurav