Couldn't Initially read email attachments – MuPDF Viewer - Annotate & View Review

When first installed this software would not read XPS email attachments (my initial review was 1 star). But after rebooting my iphone it is now working well. Several people have complained about this, so it's not just my phone that had this problem. The installation issue prevents a 5 star rating.
Review by Dc engineer on MuPDF Viewer - Annotate & View.