Anecdote: we recently made a few videos, explaining the most common tech support questions. Studio, lighting, mic, etc. and edited professionally.

Calls dropped in half at least, with those specific problems almost wiped out completely. I am shipping 1000 products per month, and handling 2-3 phone calls per day to support them.

Now planning on making more videos to cover the next most frequent generic questions, and then on to a dedicated video per product (143 products).