Also, did you merge the documents into one pdf? There have been a few applicants who mistakenly tried to upload separate documents, not realizing that every time you upload a new document, it deletes the previously updated one. So for each upload tab/option, you can only upload one pdf.
To apply from a different country, your friend would need to travel there first. That seems like a lot for a tourist visa. Maybe your friend needs to cancel this vacation and apply in a few months
If you look, Vietnam has been taking along time as well. Furthermore, not sure you can apply again while you have another application being reviewed. You might want to find that out before heading to Hanoi and then learning that. When did you apply in Cambodia? Can you push back whatever you have in Thailand. June 18 is a good amount of time away.
They want to see the money in a savings or checking account and want to see 6 months of statements to prove that you use that account routinely. It sounds like what you shared with them isn’t what they want.