This is a strange problem because it doesn’t happen all the time.
I dragged my .blend file into unity. I then opened the blend file from within unity and made new animations. Sometimes saving the animations in blender automatically updates the file in unity, but other times no changes happen - I just get a blank document appear under my file with the name of the model in question.
The import animations option in the inspector is ticked, the animations have the F next to them in blender, and just to be extra cautious I save while in object mode.
Any help would be much appreciated.