I have roughly 100 separate pdf files I need to include in a file (supporting info for a thesis). I have copied pictures from Windows' snipping tool onto the .pdf files in adobe acrobat. When I open the files, the picture is there. When I put it into my LaTex file, it is neither shown in in preview nor when I download the pdf.
I use Overleaf, pdfLaTex and the graphicx package. If anyone has a clue as to what is happening and how to fix it, that would be great.