Steven G. answered 08/27/22
Photographer and Instructor of Adobe Photoshop and Lightroom
This appears to be a bug in the Lightroom 4 that was not addressed. You can find some more info on this issue here: https://blog.campanella.se/remove-dynamiclinkmediaserver-folder/
I would recommend upgrading to the most recent version of Lightroom.
Hope that helps,
Steve