A user cannot attach rich media files to Avaya Multimedia Messaging (AMM) conversations. What is causing this problem?

[answerhappygod]

A user cannot attach rich media files to Avaya Multimedia Messaging (AMM) conversations.
What is causing this problem?

A. The user has not been entitled for Rich Content in AMM Web GUI > Client Administration > Feature Entitlements
B. The AMM License for the user is not installed on WebLM and therefore the user cannot user rich media.
C. The AMM has not been configured to access the WebLM server for the user to use rich media.
D. The Rich Content plug-in needs to be installed on the User's PC to use the rich media features on AMM.