After you do what you have done with your picture so far:
1) Make sure the file is saved as a .jpg
2) Go into the picture properties
3) Click the details tab
4) Change the 'Camera Maker' to RICOH
5) Change the 'Camera Model' to RICOH THETA S
6) Apply changes, close properties and upload to Facebook.
Changing the make and model tricks Facebook into thinking it is a 360 picture from a 360 camera.
Example with your photo attached
Looks the same until posted
View attachment 2994
By the way, I noticed the file name.
How did you stitch it together?