How to make a field required in a PDF Form
To ensure that users don’t leave blank fields in the document and fill in all the important information, you can enforce mandatory fields in the form.
See how to create required fields in a fillable PDF using different PDF editors.
Making a field required in Adobe Acrobat
1. Open the necessary PDF form, choose Forms & Signatures > Prepare Form.
2. Select the field that needs to be required, right click on it and choose Set as a Required Field:
3. Save changes.
Making a field required in Fluix taskstream
1. In Taskstreams, open the taskstream with the form you need to edit:
2. Click the task with the corresponding document and choose Forms:
3. Choose the necessary form and click Assign form fields:
4. Click the necessary field, select Make Required and click Save Changes:
Making a field required in DocFly
1. Upload the form and go to Form Creator. 
2. Click the necessary field and tick the Required box in the toolbar on the right.
3. Save changes.
