Issues connecting Apple TV 4 to iMac

PLEASE HELP!! rather randomly my mac has stopped connecting to my Apple tv. The only difference I can spot is that in the sharing options on my mac is it says .lan not .local as it did when I set Infuse up. I have tried adding a new share using .lan but the apple tv was having none of it. Strangely Plex works fine. My friend is coming round tomorrow with his small children so I’m desperate to fix it so they can watch a film while we chat.

Thanks
John

You should add on Your iMac in Preferences-Sharing-Shared folder-name of Your Home folder and after that clicking on that folder check whether is this folder is marked. Thats all what You need to go further.

best regards