PDF reader for iPad that refreshes automatically after changes to the PDF?

I am looking for a pdf reader for my iPad Pro, which automatically refreshes the pdf when another app makes changes to the pdf. I using Vim in a-Shell to edit my LaTeX document and display the pdf next to it. When I use pdflatex to compile the LaTeX-file, I want the pdf reader to automatically show the then new generated pdf. The only apps I found so far for this are the Readdle-Apps “Documents” and “PDF Expert”, but both require monthly payments after a short trail period and I cannot afford to pay monthly for something I am using regularly but not daily. I am more than happy to make a one-time-payment for it. Does anybody know such a pdf reader?