So I went and built the example and it worked fine for me.
NOTE: 1 little change in my pictures, its late I am being lazy. Before I ran this I moved my combination file to another folder and then ran it all. SO the picture of all 3 in the same folder is wrong, but everything else is the same.
So a couple of things
1. If you click View Scripts, Recent, does it look like this? so that you verify the exact name of the scripts?
2. Did you rename one of the scripts after you already attached it to an action in PA? If so you have to remove it and start again as that will cause it to fail.
The above is my scripts in my file below (pictures)
I added to files to this folder
Here is my flow.
My File
Please verify you didn't change the name of the script after you already saved it and added it to your flow. If so redo it. But it works fine for me. Also make sure you saved the script in your onedrive and NOT sharepoint because then you have to use the sharepoint script action not run script.
If these suggestions help resolve your issue, Please consider Marking the answer as such and also maybe a like.
Thank you!
Sincerely, Michael Gernaey