Problem Combining files - Always Low Resolution

[Helmer25479520v0yk]

I've used AdobeAcrobat subscription for 6 months combining files to make High Resolution PDFs. All of a sudden when I combine files they are now blurry and low resolution, even after choosing the high res option. How to I fix/change this situation?

[Bernd Alheit]

What happens when you use Insert Pages?

[Helmer25479520v0yk]

The new page is high res, the originals I combined are low res. See picture.

[Bernd Alheit]

OK