If you're creating a Multiple Response, Single Response, or Dropdown form field question that you know will have a long list of potential response choices—such as a list of states, countries, or professions—you can upload a prepared list of choices from a .csv spreadsheet. For example, if you're going to ask your submitters about their current profession, you can create a spreadsheet with a long list of options, then upload this list into a dropdown or single/multiple response field. Each field in your spreadsheet list becomes a potential selection for the submitter.
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Long list files can be added to the following form fields:

Dropdown List - Creates a list of response choices that will be viewed as a dropdown when clicked. The dropdown list helps save space on your form.

Single Response - Provides a textual statement or question followed by a list of choices. A submitter can select only one of the answers provided.

Multiple Response - Provides a textual statement or question followed by a list of choices. A submitter can choose one or more of the answers provided.

In the form fields listed above, you are given three default options, as shown below. You can delete those with the trash icon and then click Upload a List. Select your .csv file to upload.

Here is an example of what a long list spreadsheet might look like in a spreadsheet. This is a list of professional categories:

Once the .csv file has been uploaded, the selections in the spreadsheet will populate the list: