Upload file not working in project details

Summary

After upgrade my gitlab to 12.9, upload file link in Project overview - Details not working anymore, but similar function works in Repository - Files.

Steps to reproduce

  1. Upgrade gitlab to 12.9.1 or 12.9.2, I've tried both.
  2. As alternative step of 1, I tried Install fresh gitlab 12.9.2 by rpm in CentOS 7, Config /etc/gitlab/gitlab.rb, modify only the external_url, exec gitlab-ctl reconfigure, open browser to newly installed gitlab, change password of root, and create a demo project, create any file to init Repository.
  3. Navigate to "Project overview - Details", click the "+" dropdown button, and select "Upload file"
  4. In the "Upload New File" dialog, click the "click to upload" link, not the "Upload file" button, nothing happens while expecting to show an open file dialog.
  5. Drag & drop a file to the drag&drop rectangle, browser start to download that file, or to show that img if drag&drop an img file, not to upload as expected.

Example Project

There's no this issue in gitlab.com.

What is the current bug behavior?

Can't upload file in "Project overview - Details - Upload file", but it works in "Repository - Files - Upload file", and it works in Web IDE too.

What is the expected correct behavior?

It should show open file dialog after click the link.

Relevant logs and/or screenshots

image

Output of checks

(If you are reporting a bug on GitLab.com, write: This bug happens on GitLab.com)

Results of GitLab environment info

Expand for output related to GitLab environment info 
System information
System:
Current User:   git
Using RVM:      no
Ruby Version:   2.6.5p114
Gem Version:    2.7.10
Bundler Version:1.17.3
Rake Version:   12.3.3
Redis Version:  5.0.7
Git Version:    2.24.1
Sidekiq Version:5.2.7
Go Version:     unknown

GitLab information
Version:        12.9.2
Revision:       ac5568eb5d8
Directory:      /opt/gitlab/embedded/service/gitlab-rails
DB Adapter:     PostgreSQL
DB Version:     10.12
URL:            http://gitlab1.wonker
HTTP Clone URL: http://gitlab1.wonker/some-group/some-project.git
SSH Clone URL:  git@gitlab1.wonker:some-group/some-project.git
Using LDAP:     no
Using Omniauth: yes
Omniauth Providers:

GitLab Shell
Version:        12.0.0
Repository storage paths:
- default:      /var/opt/gitlab/git-data/repositories
GitLab Shell path:              /opt/gitlab/embedded/service/gitlab-shell
Git:            /opt/gitlab/embedded/bin/git

Results of GitLab application Check

Expand for output related to the GitLab application check 
Checking GitLab subtasks ...


Checking GitLab Shell ...


GitLab Shell: ... GitLab Shell version >= 12.0.0 ? ... OK (12.0.0)
Running /opt/gitlab/embedded/service/gitlab-shell/bin/check
Internal API available: OK
Redis available via internal API: OK
gitlab-shell self-check successful


Checking GitLab Shell ... Finished


Checking Gitaly ...


Gitaly: ... default ... OK


Checking Gitaly ... Finished


Checking Sidekiq ...


Sidekiq: ... Running? ... yes
Number of Sidekiq processes ... 1


Checking Sidekiq ... Finished


Checking Incoming Email ...


Incoming Email: ... Reply by email is disabled in config/gitlab.yml


Checking Incoming Email ... Finished


Checking LDAP ...


LDAP: ... LDAP is disabled in config/gitlab.yml


Checking LDAP ... Finished


Checking GitLab App ...


Git configured correctly? ... yes
Database config exists? ... yes
All migrations up? ... yes
Database contains orphaned GroupMembers? ... no
GitLab config exists? ... yes
GitLab config up to date? ... yes
Log directory writable? ... yes
Tmp directory writable? ... yes
Uploads directory exists? ... yes
Uploads directory has correct permissions? ... yes
Uploads directory tmp has correct permissions? ... skipped (no tmp uploads folder yet)
Init script exists? ... skipped (omnibus-gitlab has no init script)
Init script up-to-date? ... skipped (omnibus-gitlab has no init script)
Projects have namespace: ...
1/1 ... yes
Redis version >= 2.8.0? ... yes
Ruby version >= 2.5.3 ? ... yes (2.6.5)
Git version >= 2.22.0 ? ... yes (2.24.1)
Git user has default SSH configuration? ... yes
Active users: ... 1
Is authorized keys file accessible? ... yes


Checking GitLab App ... Finished


Checking GitLab subtasks ... Finished

Possible fixes

no