How to sort songs by number and track name on USB?

[ohrenkino]

I can't show you a video that modifies your filenames as I don't have the same files.

And if it boils down to the function, then I would kindly aks you to have a look at the documentation:

Rename Files and Import Tags from Files

Mp3tag provides a variety of possibilities to get tag information from parts of the filename or to rename files based on the information stored in the tag of a file. The base concept behind all converters in Mp3tag is the format string, which describes a pattern or template of a filename. A format string consists of any characters and predefined placeholders or scripting functions. Every placeholder begins with the percent sign %, followed by a tag field name and ends with the percent sign. …