PDF Creator bug?

latest wappler 6.5.1, php, windows, docker

I use the pdf creator to create an invoice. it all works well, everything working, i name the output file etc, all works on desktop, I can view the pdf and i can download the pdf and the pdf file has my name I assigned.

if I am on a mobile device (tried on a few mobiles) you cannot view the pdf, just gives a blank file, and if you download the file, whilst it downloads and has the correct data the file name is the random characters NOT the assigned filename (that works on desktop)

thanks