Please I need help because I am investing too much time in this problem.
When I work in ARCGIS-PRO (desktop) the shapefile visualizes correctly in the map. But when I upload the same shapefile as a compressed ZIP file to ArcGIS Online and then visualizes it in Map Viever the image resolution greatly reduces. Even when I generate the ZIP file with 0% compression factor (only storage), the problem remains.

Can you please give me a hint as to how to solve this problem?
What can I do to maintain the same resolution as in ARCGIS PRO?
Thank you very much in advance.
Daniel