🚀 Feature: Clarify upload progress

[Juliaria08]

🔖 Feature description

Add a big box indicating the progress (preferably with a percentage and ETA) of the upload progress across all files

🎤 Pitch

This would be helpful as it'd make it clear that something is happening which would be clearer than hey, this specific file's at this progress point, as noticing the little circle changing takes too much effort on the user's side.

[stonith404]

I'm closing this in favour of #199. Feel free to participate in the discussion there.