I am new to ArcGIS Online but I have been making good progress. I was told in the beginning of my learning process that I should use geodatabases in order to control data integrity with domains. (Drop down lists) Understood. I have created a simple feature class to experiment with in both a personal geodatabase and a file geodatabase. It seems a personal geodatabase cannot be uploaded to my content. ("invalid file type") It also seems that the only way to upload a file geodatabase is to zip it. But then the file geodatabase is not available in the list of layers to add to a map. I'm very confused now! How do I get a layer of polygons on my map so that when editing the attributes of a feature, there is a drop down list to control data entry?