To create any new question, you need the 'Create question' permission
A multimedia question requires the Data Entry user to attach a file. See image
Select Insert > Question. Alternative method
Enter a code for the new question. Help on creating codes...
Enter a name for the new question. Help on creating names...
Select Multimedia from the Question Type drop down list.
Click OK to create the question.
Help on other fields in question definition window...
Help on setting up question validation...
A multimedia question is displayed on the eForm as a paperclip icon. See image
When the button is clicked, an Open File window enables the user to navigate to and select a file to attach. Once a file has been attached, the icon changes to a magnifying glass. See image