Thanks for the heads up about the ipubsoft link not doing the trick. BTW, thanks also for letting me know the app you purchased from the Apple store didn't work.
I did not mention it my previous communication about this issue, but like you, I also went through the Pages excercise with my document, before I tried this forum. I suggest you pay close attention to any suggestion/hints we receive from Baltwo. IMO, Apple is lucky to have people like him who enjoy helping people like us; i.e. people with the intellect who recognize and acknowledge our lack of expertise with the technology, but are anxious to move up on the tech learning curve.
While chatting with Apple reps, it became clear to me that the most likely avenue for finding a solution is Adobe, because pdfs are Adobe documents. Apple reps have indepth knowledge of Apple software; Adobe reps have indepth knowledge of Adobe software. Unfortunately, I do not subscribe to Adobe, so I don't have free access to their paid advisors. I'm hoping I will encounter a helper in one of their community forums who is as helpful as Baltwo is in the Apple forum.
I am dealing with a pdf document that was scanned into the computer and subsequently converted to a pdf document. As I understand it, it is an image from a journal, i.e., the equivalent of a photo. When I marked the document to "show invisibles", I saw that the text is inclosed in a frame. Thus, it is not a true pdf document. I even went to the American University library, hoping that I could get direct access to the journal in which the article originally appeared. I found the article, but it was in the same pdf format that I already have. So that was a deadend.
Unfortunately, I have next-to-no knowledge of the technology behind .jpg images. But if Adobe allowed the conversion to pdf format in PDF version 1.3 Acrobat 4X, surely they will know if there is a way for users to alter text within images.
The fact that you have encountered the same problem is encouraging to me, because that tells me the issue is more likely to have been a topic of discussion in the Adobe forum and a solution already described. See you in Adobe.😉