Why doesn't git recognize that my file has been changed, therefore git add not working

Question

I am trying to push my files to github using bash. They are already on there, and I am uploading a newer version with new lines and code, etc. But when I try git add<

Answer 1

What kind of file do you tried to upload? Now I just spend almost an hour to upload my css modification. But this css compiled from a styl file therefore git just ignored it. When I changed the styl source then everything worked.

Hope it helps.