Link Librarys add changes in one file

i use link librarys to distribute my armature and animations
so i have one .blend file with my armature and all animations
now i want to make some changes in the animation but not in the file with the armature but in the file which is linked to the aramture
when i do this the changes are not stored, always the original animations out of the library file are restored – ok thats normal
my question:
is there a way to make changes in an animation in the linked file and these are added to the original animatiosn (but don´t changes them) and are stored
hope you unterstand

many thx blownlightbulb