Work-packages <-> Media sync synchronization issue

Hi guys!
I encountered some problem with co-work with 2 mergin extensions: media-sync and work- packages. Do you have any hint how to correctly transfer JPG attachments from child to main project? I coreectly set-up media-sync to work with only main project but for the child i constantly have POST error as if it is doing updates only for GPKG files that i have in my project