There are some more postings on this topic but I've found no working/satisfying solution for my problem.
Some solutions work well for figures spread over the whole document. For me it is much more comfortable to have all pictures in a separate file. Including this once from the include point on I'll have all figures from the file on the left page and all text on the right.
I tried to modify the code from here, but it still is not what I'd like to have. Because if I include the file, I get all figures on the left, but no text on the right - there will be only blank pages.
The major problem is that I've \documentclass{book} with about 50 A4 sized images and 70 pages of text. So I want to put all images on the left side and the text on the right for better readability.
I generate the figure blocks automatically - this is the major reason for having a separate file.
