hmm I could've swore I uploaded pdf just fine, because of this issue with multiple docs having to be attached in one file. It was even my gf's rental agreement and her id as well.
While I understand some people might want a 'full service' advice, I would recommend you come to this group and ask pointed questions - answers even by 'experts' can be contradictory and not always correct.
"That means a lot of people have succeeded in getting their documents examined and visas approved."
To be clear, I never claimed that one needs to have documents reviewed to get approved (or denied). Only that documents are hardly used for adjudication (because they can be faked).
I have countless other reports from actual applicants similar to this one (this is from applicants in the Philippines), but also in Thailand and other countries.
And yes, the process can look arbitrary, especially when seen from the point of view of a single person's application. The VO's decision making process is a black box, but with my fairly large data pool I've been able to discern some patterns, particularly in terms of which days of the week, and even appointment times (early in the day vs lunch hour) may yield higher approval rates, which are (a rather normal) reflection of the subjectivity of the humans behind making these decisions.