Damn i try to upload in COE and receive this error message after the submission...
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Answer summary
Users facing an error message while submitting documents for the Certificate of Entry (COE) in Thailand are advised to try re-uploading the documents just before final submission. Taking too long between submissions may lead to such errors.
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Petteri **********
Try to re-upload the documents just before hitting submit. It worked for me (2nd time).
I think that if you take long break between submit, that can cause the error