It’s not another $#%@ cloud platform. Placemark doesn’t make you upload your data to yet another server. You can open files and save them.
Drag some data onto the map. Draw a few points. Relax, this isn’t ArcGIS.
Have a CSV file with ZIP Codes? A GeoJSON file with some lines and polygons? Some WKT from your database? Placemark can handle it, and convert it to what you want.
Spatial is only half of spatial data. Placemark handles the other half - attributes - with a particular pizzazz. Edit JSON values in GeoJSON. Bulk-edit attributes in a table.