@Aklapper Yes, Let's resolve it. I tested and things look good to me now.

The widget has been created and it has been enabled on 19+ Wikisources till date.

Let's also study on this can implemented on Mobile view. I appears differently based on the screen size but I do see a Download Epub button on English Wikisource (using WSExport) and a Download PDF (using ElectronPDF most probably) as well. But is not uniform across wikis on whether different formats are available or not.

This looks pretty great to me. I personally think that the third option i.e. to have a little explanation around what Epub, Mobi and PDFs mean will be really helpful.

@Samwilson Do we close this task as the improved tool does look for IA identifiers?

The tool should work better now. Also, the file mentioned in the task was manually uploaded to Commons.

@Jkylefenton The IA-Upload tool has been improved now. Can you check if it works for you now?

@Samwilson Indeed this does capture our discussion neatly. Thank you

Yes! Thank you for pointing to this. This has been completed

@Douglaskmccarthy Indeed, it would be really awesome if we are able to query this data.