The Pop-Up Window should show the PDF-Icon on both sides.
This is what it looks like:

Easy to reproduce.
Operating system:
Web server:
Database:
PHP version:
ownCloud version: (see ownCloud admin page)
10.0.4
**
@PVince81
log file please
Can麓t see anything related to this in the logs:
{"reqId":"JxjQmAqHxc1T5ZAyQv3a","level":3,"time":"2018-01-10T13:31:10+00:00","remoteAddr":"::1","user":"--","app":"PHP","method":"GET","url":"\/index.php","message":"Undefined variable: user at \/opt\/owncloud\/lib\/public\/Util.php#193"}
{"reqId":"XaFwEnVufJTI7wpVGpAw","level":2,"time":"2018-01-10T13:31:15+00:00","remoteAddr":"91.45.209.38","user":"--","app":"core","method":"GET","url":"\/","message":"Trusted domain error. \"91.45.209.38\" tried to access using \"docker.oc.solidgear.es:11312\" as host."}
{"reqId":"dnxWvJVCjxJKdr6NPV3j","level":2,"time":"2018-01-10T13:31:16+00:00","remoteAddr":"91.45.209.38","user":"--","app":"core","method":"GET","url":"\/index.php\/core\/js\/oc.js?v=e013adfbcde44eac369f6fa6233ca4f3","message":"Trusted domain error. \"91.45.209.38\" tried to access using \"docker.oc.solidgear.es:11312\" as host."}
{"reqId":"J26gw9utHwEUL96zskP7","level":2,"time":"2018-01-10T13:31:17+00:00","remoteAddr":"91.45.209.38","user":"--","app":"core","method":"GET","url":"\/cron.php","message":"Trusted domain error. \"91.45.209.38\" tried to access using \"docker.oc.solidgear.es:11312\" as host."}
{"reqId":"2LOLgoAdQh1OkIvCtKv9","level":2,"time":"2018-01-10T13:32:03+00:00","remoteAddr":"91.45.209.38","user":"--","app":"core","method":"POST","url":"\/index.php\/login","message":"Login failed: 'admin' (Remote IP: '91.45.209.38')"}
{"reqId":"Fm3DyCN3bChYkbIlxIC6","level":3,"time":"2018-01-10T13:32:09+00:00","remoteAddr":"91.45.209.38","user":"admin","app":"PHP","method":"GET","url":"\/index.php\/apps\/files\/","message":"include(layout.noscript.warning.php): failed to open stream: No such file or directory at \/opt\/owncloud\/apps\/theme-enterprise\/core\/templates\/layout.user.php#36"}
{"reqId":"Fm3DyCN3bChYkbIlxIC6","level":3,"time":"2018-01-10T13:32:09+00:00","remoteAddr":"91.45.209.38","user":"admin","app":"PHP","method":"GET","url":"\/index.php\/apps\/files\/","message":"include(): Failed opening 'layout.noscript.warning.php' for inclusion (include_path='\/opt\/owncloud\/apps') at \/opt\/owncloud\/apps\/theme-enterprise\/core\/templates\/layout.user.php#36"}
{"reqId":"STG4BR1Sy5q1cKGB2QNa","level":3,"time":"2018-01-10T13:33:41+00:00","remoteAddr":"91.45.209.38","user":"admin","app":"PHP","method":"GET","url":"\/index.php\/settings\/personal","message":"include(layout.noscript.warning.php): failed to open stream: No such file or directory at \/opt\/owncloud\/apps\/theme-enterprise\/core\/templates\/layout.user.php#36"}
{"reqId":"STG4BR1Sy5q1cKGB2QNa","level":3,"time":"2018-01-10T13:33:41+00:00","remoteAddr":"91.45.209.38","user":"admin","app":"PHP","method":"GET","url":"\/index.php\/settings\/personal","message":"include(): Failed opening 'layout.noscript.warning.php' for inclusion (include_path='\/opt\/owncloud\/apps') at \/opt\/owncloud\/apps\/theme-enterprise\/core\/templates\/layout.user.php#36"}
{"reqId":"jhvYEGu1l2y1lUpDKVkm","level":3,"time":"2018-01-10T13:33:44+00:00","remoteAddr":"91.45.209.38","user":"admin","app":"PHP","method":"GET","url":"\/index.php\/settings\/admin?sectionid=diagnostics","message":"include(layout.noscript.warning.php): failed to open stream: No such file or directory at \/opt\/owncloud\/apps\/theme-enterprise\/core\/templates\/layout.user.php#36"}
{"reqId":"jhvYEGu1l2y1lUpDKVkm","level":3,"time":"2018-01-10T13:33:44+00:00","remoteAddr":"91.45.209.38","user":"admin","app":"PHP","method":"GET","url":"\/index.php\/settings\/admin?sectionid=diagnostics","message":"include(): Failed opening 'layout.noscript.warning.php' for inclusion (include_path='\/opt\/owncloud\/apps') at \/opt\/owncloud\/apps\/theme-enterprise\/core\/templates\/layout.user.php#36"}
{"reqId":"XUdwpZWvA0eKOFixVRBs","level":3,"time":"2018-01-10T13:33:51+00:00","remoteAddr":"91.45.209.38","user":"admin","app":"PHP","method":"GET","url":"\/index.php\/settings\/admin?sectionid=help","message":"include(layout.noscript.warning.php): failed to open stream: No such file or directory at \/opt\/owncloud\/apps\/theme-enterprise\/core\/templates\/layout.user.php#36"}
{"reqId":"XUdwpZWvA0eKOFixVRBs","level":3,"time":"2018-01-10T13:33:51+00:00","remoteAddr":"91.45.209.38","user":"admin","app":"PHP","method":"GET","url":"\/index.php\/settings\/admin?sectionid=help","message":"include(): Failed opening 'layout.noscript.warning.php' for inclusion (include_path='\/opt\/owncloud\/apps') at \/opt\/owncloud\/apps\/theme-enterprise\/core\/templates\/layout.user.php#36"}
{"reqId":"B0yIS5IAdiujqaJnOYvq","level":3,"time":"2018-01-10T13:33:57+00:00","remoteAddr":"91.45.209.38","user":"admin","app":"PHP","method":"GET","url":"\/index.php\/settings\/admin?sectionid=general","message":"opendir(\/opt\/owncloud\/themes): failed to open dir: No such file or directory at \/opt\/owncloud\/apps\/templateeditor\/lib\/mailtemplate.php#155"}
{"reqId":"B0yIS5IAdiujqaJnOYvq","level":3,"time":"2018-01-10T13:33:57+00:00","remoteAddr":"91.45.209.38","user":"admin","app":"PHP","method":"GET","url":"\/index.php\/settings\/admin?sectionid=general","message":"include(layout.noscript.warning.php): failed to open stream: No such file or directory at \/opt\/owncloud\/apps\/theme-enterprise\/core\/templates\/layout.user.php#36"}
{"reqId":"B0yIS5IAdiujqaJnOYvq","level":3,"time":"2018-01-10T13:33:57+00:00","remoteAddr":"91.45.209.38","user":"admin","app":"PHP","method":"GET","url":"\/index.php\/settings\/admin?sectionid=general","message":"include(): Failed opening 'layout.noscript.warning.php' for inclusion (include_path='\/opt\/owncloud\/apps') at \/opt\/owncloud\/apps\/theme-enterprise\/core\/templates\/layout.user.php#36"}
reproduced - looks like if no preview can be generated the fallback to the mime icon is not working in the javascript side of the conflict dialog.
this needs a js developer @felixheidecke

I think @VicDeo worked on previews lately when fixing something about supported mime types, so I'd rather ask him to have a look as he's more familiar
This is the sort of thing where you could have a million UI tests! There are so many buttons, fields, icons in a UI. Each of them (should) be there for a real reason. So if any go wrong it is a real regression. Any could go wrong with a range of combinations of file type, text input (unicode chars, special chars...),...
you could have a million UI tests
...and slow down your build by 2-3 hours more in case your environment is capable to run 100 UI tests per second.
Is it affordable price for a minor UI glitch. :)
https://travis-ci.org/owncloud/core/builds/327302557 "Running for 3 hrs 10 min 40 sec" so far.
Really annoying
Yes, this is the problem with UI tests - they are slllllooooowwww. To get decent turnaround a whole farm of test infrastructure is needed to run 20 or 30 parallel scenarios.
ok - let's agree to simply fix it - ok?
Fixed in master/stable10 with https://github.com/owncloud/core/pull/30123 and https://github.com/owncloud/core/pull/30125
To be shipped with 10.0.6
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