I've been investigating a problem that exists with people running not-the-latest Android tablets or phones. I am running PW 3.0.32, ProCache and Let's Encrypt SSL. Regardless of having nginx or apache web server the same problem exists. User clicks on a pdf link from my site, all they will get is blank screen. Nothing happens. No entries are found in either access or error logs or PW logs.
This problem exists with Android stock browser and Chrome on Android version 4.4.2, but not with (latest version of) Opera on the same device. Maybe needless to say, but I cannot reproduce the error with iOS or OSX versions of the common browsers.
Maybe this is has nothing to do with PW, but I was not able to find any applicable sources for investigating the issue.
So any help or pointers would be appreciated. Thank you in advance :).