How to upload a custom file from 1 with standard mechanisms?

Question

1C

Maybe someone has a link to a material on this topic.
The essence of the task is such that in addition to uploading goods, prices and orders, you need to upload another file that is assembled independently, but it is desirable to do this using standard methods of uploading to the site.
So the question arose of how best to do this and maybe there are already ready-made solutions

Answer 1

Attach this file to the nomenclature - it will be uploaded to the FILES section.