How do you ask when the recruiter asks to meet?

You can't ask PS in the interview. You should look at the place where you interviewed first. If you just need a simple PS, you can say that you can learn it, because you can learn some basic P-graphs and change the file size soon.

However, if you need professional PS design very much, it depends on whether you want to develop in this area. If you have, you can ask your colleagues while studying. The salary is little or no, but this is a bit difficult.