First, thank you all a lot for helping the whole community make advances in the connexion between SNAP and StaMPS. A special thank to @katherine who helped a lot with her detailed step to step how-to.
I managed to make the whole process work, but I have a strange issue. It seems that the processed area is not the area seen during the scene subsetting. By that, I mean that the scene I substracted does not correspond to the final geolocation after the whole process. One image talks more that a thousand explanation I think:
Does someone has a hint to provide me? Did I forget an important step?
Thank you all for your precious help.