@woshibug wrote: Because I use a tool to get combined pdf but version is 1.3 which is not suitable for sponsor's App,their app need 1.5 or above.
And how would changing the labeled type without actually re-creating the PDF file help with that?
It does seem strange however that the APP cannot use the older PDF files as input. They should be forward compatible. There should not be anything in a 1.3 version file that cannot also appear in a 1.5 version file. Are you sure something else isn't going on? What does the APP do? Perhaps it is expecting the PDF file to only have text and the one you are trying to use instead has scanned page so the text is not available, just the picture of the page.
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