Attaching multiple files to a wiki page doesn't work
Summary
Trying to attach multiple files to a wiki page simultaneously results in "9:Could not update master. Please refresh and try again" error.
Steps to reproduce
On any project wiki page click "Attach a file" and select multiple files
What is the expected correct behavior?
Multiple files should be attached to a wiki page
Relevant logs and/or screenshots
Output of checks
This bug happens on GitLab.com
Edited by nifuki