Every document must be up to date, not years old. Anything that does not relate to your application, like your cat, don't mention them. If you have actually searched past posts in the group most of your other questions have already been answered, and from people actually applying in Spain.
there is no certainty in anything, but from many reports of rejections after the applicant left the country they applied in, it is an educated guess,with a high rate of probability.
How ever the remote company pays you is of no concern to immigration, only that you are getting paid to work remotely, and the company gave you a written letter stating that you can work remotely.