[Bug] Files: Preview on Safari

[bayerhazard]

Description
Please Provide the basic information of the app
When using Safari on the Mac, most of the times preview of files like pdf is not working.

Describe the bug
If you are using Files via the browser, you can double click on files to get a preview of this file. This works fine on a Google Chrome Browser. But when using Safari on a Mac, the preview opens but keeps blank.

To Reproduce
Open Files on Safari and double click a pdf file. Windows opens but stays blank.
Open Files on Chrome and double click on a pdf file. Windows opens and shows the pdf file.

Expected behavior
Show preview also on Safari.

Screenshots

[pengpeng]

@bayerhazard

We will try to reproduce this issue and fix it in the next release. At the same time, we will run regression tests on the system applications in the Safari browser.