Hello,
Thank you for your interest in NodeXL!
We are experiencing this problem with other Office 365 users lately. Please follow these steps to activate the “Document Actions” pane:
Open Excel
Got to File->Options
In the “General” tab, under “User interface options”, select the second option “Optimize for compatibility”
Close Excel
Open NodeXL
For more details please refer to this URL: https://support.office.com/en-us/article/outlook-attachment-preview-failure-88020c8e-43ae-4582-9554-511fbaf0d138
–
Marc