Hi, we are trying to upgrade our Partner Community from Classic to Lightning but having trouble with Email.  We have already upgraded our Customer Community and internal Org but have found a challenge with trying to give our Partner Community users the ability to perform the tasks they used to in Classic.

One of the main tasks is emailing Case Customer Contact but the Send Email Quick Action is not displaying on the Case Detail page within Lightning.   The ability for Partner Community Users to collaborate with customers re Cases via email is currently available in Classic Communities and we have used this functionality for 4 years.  Why would Salesforce remove this functionality in Lightning?

Does anyone know of any workarounds to get past this major limitation,  as we have now had to put our project on hold. 

Thanks Tim