Modify linked objects

I have made an object in one file. Then I created a new file and linked to the collection in the first file. How can I add modifiers to the linked collection?

For example I want to create cuts in the linked object. When I update the first file later then the second file could profit from that change.

I also tried linking to an object instead of linking to a collection. Then I also cannot rotate or scale it.

I hope it is possible…