There's a little mistake into issue's description. the problem is, that tool reads content of <img> element when it is built, and it doesn't read again the content of <img> tag when it is shot. One from it.wikisource tools changes dynamically <img> content (take a look to "eis", edit in sequence, gadget to understand why it happens), it successfully uploads the new image into canvas, but it can't change image's url into ocr tool.
I think that fiuxing the issue should be very easy: what is needed is simply to read again <img> current content when the tool is clicked.

In T298663#7665215, @Alex_brollo wrote:

There's a little mistake into issue's description. the problem is, that tool reads content of <img> element when it is built, and it doesn't read again the content of <img> tag when it is shot. One from it.wikisource tools changes dynamically <img> content (take a look to "eis", edit in sequence, gadget to understand why it happens), it successfully uploads the new image into canvas, but it can't change image's url into ocr tool.
I think that fiuxing the issue should be very easy: what is needed is simply to read again <img> current content when the tool is clicked.

We definitely want to retrieve this info from OSD. Especially with features of eis being integrated into ProofreadPage (per T308098), I'm not sure we want to use the <img> as the single source of truth for the current image.

Change 860526 had a related patch set uploaded (by Sohom Datta; author: Sohom Datta):

[mediawiki/extensions/Wikisource@master] [Wikimedia OCR] Use OSD instead of Page image

https://gerrit.wikimedia.org/r/860526

Change 860526 merged by jenkins-bot:

[mediawiki/extensions/Wikisource@master] [Wikimedia OCR] Use OSD instead of Page image

https://gerrit.wikimedia.org/r/860526