i disable few days ago all extension because was thinking this is a problem with compatibility....

Hello,
My test WIKI is on https://wiki.taken.pl - this is a fresh install with MsUpload.

Do You want access to my fresh version of 1.27.2 ?
I put for You guys on my vmware.

Are You there :)?

I just create a test server on my vmware and again check on fresh instalation ane same effect, please contact with me on e-mail i give you full access to this server include root to diagnose problem, but looks like problem with PHP7.

I don` t see any errors just only load without errors this:
https://xxxxxxxx.pl/load.php?debug=false&lang=pl&modules=ext.MsUpload%7Cjquery.checkboxShiftClick%2Ccookie%2CgetAttrs%2ChighlightText%2CmakeCollapsible%2Cmw-jump%2Cplaceholder%2Csuggestions%7Cmediawiki.action.edit.collapsibleFooter%2CeditWarning%2Cstash%7Cmediawiki.api%2Ccldr%2CconfirmCloseWindow%2Ccookie%2Cicon%2CjqueryMsg%2Clanguage%2CsearchSuggest%2Cuser%7Cmediawiki.api.user%2Cwatch%7Cmediawiki.language.data%2Cinit%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.page.ready%7Cmediawiki.page.watch.ajax%7Csite%7Cuser.defaults&skin=vector&version=9835b89e05c5

More info about system:
Apache Server version: Apache/2.4.25

Edit: I just check and this is not webbrowser problem i check on Microsoft Edge and Microsoft Internet Explorer 11 ane same effect, no Drag & Drop box.