It works for me. I scanned a page with Arabic content, saved it as PDF on Acrobat.com, opened it on iPhone, I clicked on the highlight tool at the bottom, a mesage showed informing me that the content is an image, and that I can run the text recognition, which I did…
Soon after, another message appeared saying English text is now recognized
At this point, I was able to highlight Arabic as well as English text, though the Arabic is getting highlighted from left-to-right however it is understood that Acrobat doesn't handle Arabic well everywhere.
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