LM-only configuration, to disable thumbnail previews on link
attachments.
Revert "LM-only configuration, to disable thumbnail previews on link attachments."

This reverts commit fdac33dcfecb8cb011325194d375c0b7f9136a2f.
LM-only configuration, to disable thumbnail previews on link
attachments.
Merge pull request #224 from myomaunglm/LMonly

Remove link attachment thumbnail previews