I am back far too soon to say the reason was. I am working in a Teamwork file. The story I wanted to paste the mesh to was not in my work space.
However, it should be noted to GS that a prompt should be presented to the user when trying to paste objects on stories outside of your workspace.
DST
Terrence Sturm, Architect
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MBP OSX 10.15.4 Quad Core Intel i7 2.2hz
AC 17 build 5019
AC 22 build 7000
AC 23 build
AC 24 build 5000
