Affected device(s)

Samsung S9 on Android 9.
Can't reproduce the issue on my other testing device (Nexus 5X on Android 7.1). Also tried on emulators with no luck.
@malinajirka confirmed that he was not able to reproduce this exact issue on his devices (Emulator + Pixel 3 Android 9).

Expected behavior

The Uploading notification to be correctly cleared if I stop the Media Uploading by tapping on the media and selecting "Stop Uploading".

Actual behavior

The network connection is correctly stopped, but the notification is still there in the notifications center, the progress indicator is of course stuck at the current position, and a new Upload failed notification is added to the stack.

Steps to reproduce the behavior

• Start Aztec
• Add a Video
• Tap on the video and select Stop Uploading
• See the notification still in the system NC, and the new notif about upload failed

See also Scenario 3 here.

I also noticed that sometimes weird things happen with media notifications.

• 2 uploading notifications not grouped into 1
  

• Tried to upload 2 files, after the 1st video finished I got this in the notifications center:
  
  (Not sure of the steps to replicate this issue)

Tested on current develop - d3c89dd7d4dcd3d138bc544642b3ace38cb2a96a

cc @mzorz
@marecar3