Page contains more than 1 image, likely not a scan
When uploading the scanned exams, I get the error: Unexpected error: Page 1 contains more than 1 image,likely not a scan
This happens for every scan, also after deleting all but one very clean page from the pdf. Flattening pdf or printing to pdf does not help.
This seems related to issue #239 (closed) mentioning that some scanners produce pdfs whose pages consist of multiple images (to reduce size). I tried the advice given there to use a python script to convert the pdf into a 1 image/page format but have not yet succeeded to get wand installed and working.
If the scanner really is the problem here (I used the Xerox C8045), then a simple workaround would be useful since all printers are being replaced by the new Xerox machines.