Did you apply as the owner of your own company, the one you do contract work under? Or as contracted staff for your client?
Just curious as they seem to only ask for tax returns if you own the company you’re working for, but they also asked for a paystub which is something given to W2/salaried employees.
Normally you wouldn’t have both unless you issued yourself a paystub.
It will depend on what grounds you’re applying and then what your situation is.
Remote worker for example could be employee for someone else, could mean you own your own business, and they’ll probably want different documents for each.
Need to be specific about your situation, then contact the consular services for various embassies.
Some don’t seem to reply, others do.
The one in Vientiane has been very good at responding to emails regarding the visa requirements.