Pictures and additionaly inserted text is not displazed in PDF file in Acrobat Reade on iOS

[Petr24334375o925]

I create DOCX file in Microsoft word or in Libre Office and I create it with images which I place into the file.
After that I export the DOCX document as PDF, or as A-PDF file.

After that I copy the PDF to my webhosting server.

After that I placed a smal text (social DRM) into the PDF document on web server. I make it through PHP script.

When I download the PDF document form server to local disk on PC with windows10 and I open it in Adobe Acrobat Reader, or in any internet browser, then images and social DRM text is displayed correctly.

When I download the PDF document form server to local disk on Apple PC and I open it in Adobe Acrobat Reader, then images and social DRM text is displayed correctly.

When I open the PDF document dirrectly form webserver in Safari web borwser on iPhone or iPad, then images and social DRM text is displayed correctly.

But when I download the PDF document form web server to local disk on iPad or iPhone and I open it in Adobe Acrobat Reader, then images and social DRM text are not displayed. Only empty area is displayed except them.

Pleas can anyone help me with it?