Unable to add to Sidebar Favorites

got weird problem. i'm trying add network share icon sidebar favorites , doesn't seem add. click on mac under devices. can see network volume on right side, try drag favorites menu , shows fraction of second disappears.

ideas can make stick?

 

select it, go file>add sidebar (or select item/folder/etc , "command-t")...

 

Forums Macs macOS Older OS X Versions Mac OS X Lion (10.7)

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