You're mixing up named variables and track variables ... and you're ignoring the parallelism of Yate actions.

You're copying every artist field to the same named variable which can only hold one thing a time. If you really wanted each Artist in a variable you would use a track variable as follows:

Copy the Artist field to Variable 1

However this will not work for what you want as the Copy to Clipboard statement is documented as running only once, regardless as to how many files are selected.

This will work:

Build List with delimiter "\n" in named variable 'artists' from field Artist (As found) string delimiter "\~"
Copy named variable 'artists' to the clipboard

The first statement builds a list of artists delimited by a newline character (\n). The source is the Artist field of all selected files. The second delimiter is not used as you are not breaking down each individual Artist field. The resultant text is saved to named variable 'artists'.

The second statement copies the named variable 'artists' to the clipboard.

I've uploaded the snippet to: https://2manyrobots.com/actions/Copy-artists-to-the-clipboard.zip

As far as importing tags from a text file there is a text importer available on the resources web page named Generic Text Importer. Basically you use a File to Tag template to describe the layout of the file ... which can be one or more lines of text per file.

There are a few Yate scripting concepts that you have to get your head around. I strongly recommend reading Yate and the P Word which is a document available on the resources web page in the Documentation section.

2MR2: both work perfectly. The copy action, and the import idea. Thanks a lot.