Web Tool Choice List not working for user input

[CourtneyWatson]

I would like to add a choice list to the Web Tool I have published in portal that I have added in a webapp widget.  What this tool does is takes an input (work pack), does a select by location of all the features that have this work pack in their attributes and then sends them in a zip file to the entered email.  Data is stored on SQL Server.

The Work Pack names are quite long and I don't really want the user to type them in so ideally a drop down list of the names in the widget would be best.  

I don't have the option to add a choice list for some reason in the input mode.

Is there any reason why this would not be available?  Using Pro 2.9.

[JessicaRouns]

In your python toolbox, have you set the parameter correctly? It should look something like;

param = arcpy.Parameter(name = 'in_list',
display_name = 'Input List',
direction = 'input',
parameterType = 'Required',
datatype = 'GPString')
param.filter.type = 'ValueList'
value_list = ['Option 1', 'Option 2', 'Option 3']
param.filter.list = value_list
 

Once your tool knows it is a drop down list, then when you go to publish it you will have the option of 'choice list' for your input mode.