Cannot open the pdf file in the browser via public link

[ScharfViktor]

Steps to reproduce

1. Create pdf file into folder
2. Create public link to the folder
3. Open public link
4. Try to open pdf file in browser

Expected behaviour

The file can be opened in a browser

Actual behaviour

The file was downloaded, not opened in a browser

Screen.Recording.2021-12-10.at.14.51.33.mov

Env:
up ocis local
OCIS_VERSION=v1.16.0
Web_version= v4.6.1
BRANCH=v1.16.0-rc2