Ah okay I understand thanks for taking the time to explain. So the field “screenshot” is of type Image right? I never actually used this plugin so I’m just taking a guess here, but would it help to add a new field “URL” of type Text in your data type Screenshot?
Then in your workflow “Screenshot Outputter is generated”, save the URL as a text in your new field “URL”. Then put that URL in the Run Javascript? I might be wrong though - let me know how that goes