Built-in PDF renderer.
X-plore has now own PDF renderer, which shall fix certain problems with Android's built-in PDF rendering.
It allows opening password-protected PDF files, and has better support for thumbnails in network locations.
Compatibility is still being tuned, if you find PDF file which doesn't work, please send it for checking.
Old PDF rendered can still be enabled in Menu>More>Tweaks>Use Android PDF renderer.