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I am creating an ArcTool and wanting to have my input parameters encompass a drop down menu where files in the TOC can be chosen. The tool is shown below This is the current look of the tool.

I currently have a .csv and .shp sitting in my TOC and would like to have dropdown menus present on the "Stats File" and "Spatial Data" parameters so that I can choose them easily, instead of browsing to the file through the folder connection.

I am receiving an "Invalid Drop Item" message.

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    Is this a Python script tool in a *.tbx or a Python Toolbox tool (*.pyt)? Either way I think drag and drop functionality should just work in the same places that it does for any system tools. I think you should use a test tool to describe a single parameter that you think should but does not appear to be supporting drag and drop. – PolyGeo Sep 29 '16 at 22:39
  • @PolyGeo it is a script tool in .tbx. I am receiving an "Invalid Drop Item" message. This also occurs with a test tool. – Harmzy15 Sep 29 '16 at 22:48
  • Next time you have a question about script tool parameters, please include a screenshot/description of the tool properties not just the tool dialog so we can see what data types you have actually set for the input parameters... – user2856 Sep 30 '16 at 0:04
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Assuming this is a script tool, you need to setup your input types accordingly from Parameters tab of the script Properties. For your layer parameter, select Feature Layer and your csv input (as in your TOC), select Table View from the Data Type column.

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