I think you should paste the contents of the pdf_tex file into your question. Then all the necessary info will be in the question itself, which is better than relying on external sites, in my opinion.
Note also that if you upload a PDF as an image to the post, it will be converted to PNG, I don't think the original PDF is saved.
To second Torbjørn: It is strongly preferred to include content of your TeX file into your question.
But in almost all cases you should reduce the code to the absolutely necessary parts. This is called a minimal working example or short MWE. We have an own meta question here (see I've just been asked to write a minimal example, what is that?), and you ...