Do Qatar Airways and Thai immigration accept a PDF of the PCR test certificate or must it be a hard copy?

Travelers are advised to carry a hard copy of the PCR test certificate when flying with Qatar Airways to Thailand, as it is recommended for both airline boarding and immigration procedures. While the Qatar Pass application indicates acceptance of digital copies, there are widespread reports that printed versions are necessary to avoid complications. Many travelers inquired and shared experiences regarding the QR code from the Thailand Pass, with several recommending proactive reapplications if issues arise.