Hey Nikola, I have a very Major issue with related data items and have raised it to be fixed ASAP however I'm working in a huge project and looking for any workaround
Now, In Multisites scenario, when I create a "related data items" field or" Related media", it asks me for the provider which is non-logical, it should work like in 7.1 the new multi child related items, It automatically detects the current provider and apply it for this field.
For Ex. Im working in implementing "related Data items" field for 2 diff countries, so its non-logical for an entity in country A to get its own images from Country B ...
Now When I set the provider to Country A Provider, it stops working when I switch to country B because no permissions granted for this image library.!