I created a NLA strip for my animations.
If you need help on that ask.
Note that the tracks are under the selected armature.
Note that there is a 4 frame gap between tracks.
Note that the last track end frame matches the timeline length.
Note that the bone type is octahedral.
When exporting select the armature and model.
In the exporter check selected only.
In the exporter make sure that start frame = 0 is not selected since blender starts at frame 1.