aha, pravda, tak unity sprajty v resources asi opravdu nepackuje. not bug, feature :/
Temporarily move the folder that contains your sprites outside of the Assets/Resources folder 2. Change the packing tag on all of the sprites 3. Select Pack from the Sprite Packer 4. Finally, move the folder back into Resources
*it is necessary to do all of these steps every time a sprite is changed, including step 2, or else the Unity editor will not consider all sprites for packing