Affects Version/s: 2.5.4
Fix Version/s: None
Summary of problem:
iOS - "undefined" word shown. Refresh safari on same URL helps.
Android - File is downloaded but a toast message says "Can't open file".
The downloaded file seems not recognized by the OS.
For example in Android, the PDF file has its unique icon. But when I browse to open download folder via default "Downloads" app, the PDF is with an blank icon.
Related discussion: https://moodle.org/mod/forum/discuss.php?d=229344#p1094630
Further, I wish that forum attachment such as PDF can be viewed directly in browser that support it!