Document Scanner 42.0 PDF save version needs updating.
Document Scanner 42.0 saves to a PDF using PDF version 1.3 which is being rejected by some banks looking for a newer version. LibreOffice is saving to a PDF version 1.6 by contrast. Document Scanner is a very nice program so please consider updating this function. One work-around is to save the file. Then bring up the PDF in LibreOffice and then re-save it.