Downloaded experiments don't show up in default download manger

**Describe the bug**
When using the download function it shows a notification that the file is being downloaded, by clicking on that notification the default Android download manager opens, however the file is not visible there. When double checking in the local storage, the file can be seen, but this is not the usual user flow when downloading a file.
This behaviour happens on a Google Pixel 3A with Android 11.

**To Reproduce**
Steps to reproduce the behavior:
1. Create an experiment
2. Click on "Download"
3. Click on the download notification or start Android's default download manager
4. See that the experiment doesn't show
5. Double check, that it is actually downloaded by entering the physical download folder over the local storage file manager

**Expected behavior**
The push notification should bring the user to a view where the downloaded file is listed and Android's default download manager should list the file.

**Screenshots**

Start by reproducing the download flow on Android 11 using the listed steps, then trace how the download notification opens Android’s default download manager. Done means downloaded experiments appear in that manager and the notification opens a view where the file is listed.

Written by the indexing model from the issue text.