Xodo supports the creation of fillable form fields such as Text fields , Checkboxes , Signature fields , Radio buttons , Combo boxes , and List Boxes  Here's a short guide on how you can create these types of annotations.

1. Long press any empty space in your document and select "FORMS" in the menu overflow of the quick menu:

2. Choose a type of form field that you want to create, then press and drag the rectangle so that it contains the area that you would like your form field to be located:

3. The form fields are now ready to be filled: