What should I upload for international travel proof if I haven't traveled in the last 12 months when applying for a Thailand 60-day visa?

When applying for a 60-day visa to Thailand and asked to upload proof of international travel from the last 12 months, you can upload blank pages of your passport, a written declaration stating that you have had no international travel, or a photo of older passport stamps if you have them. Several users report that these methods have been accepted.