Does anyone know what to do, if there is an international trip right before you enter Thailand, but after you applied for the Tourist Visa? Thank you! Do I have to write the embassy a note, that I will be traveling in the future? Or just leave it blank.
About this: "Applicant is required to upload his/her passport pages which contain all travel records for the past 12 months (1 year) since the last international trip. "
TLDR : Answer Summary
If you have already applied for a Thailand Tourist Visa and have an upcoming international trip, you do not need to inform the embassy. Once your visa is issued, you can travel without notifying anyone, as long as you enter Thailand before your visa expires.