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Adobe Acrobat version 18.07.30 doesn't show some letters in my books (some books, not all of them) IOS version 11.4.1 How can I fix the problem?
On other devices or using iBooks there is no problem.
Sorry for the delay in response.
As you have mentioned above, you are reading iBooks.
Could you please confirm if you are using Adobe Acrobat Reader or the Adobe Digital Edition to view the PDF?
If you are using Reader for iBooks, could you please let us know if the file is saved on the device.
It can be the font issue due to which the text is not showing on the mobile application.
Did you check if you can open that PDF on your desktop application without any issue?
Please try to use Adobe Digital Edition for the iBooks on your device.
Check if that helps.
Let us know how it goes.