I have some geometric data and I set its coordinate system to *XY-FT* and I verified it was correctly changed using the data inspector. I am writing this data on the ArcGis Online Plateform and I set the coordinate system to *XY-FT* again in the transformer parameters. When I view the written data, the coordinate system is not the one I chose but the SPHERICAL_MERCATOR.
How can I solve this problem?