I have problem with my character, which I append to my file. Keyframes in Dope sheet are semi-visible as you can see in the image. When I change position of any bone of this character, keyframe appears. After closing the file and reopening, new added keyframes are lost. Please help me where is the problem and how can I fix this? Thanks.
Click the F to save the animation in the Action Editor. It stands for Fake User. Blender will discard data that does not have a user when you save a file.