Whenever a ZIP archive is being uploaded (which, over a slow network, may be a lengthy process),
a gray bar with rounded corners appears in the UI (immediately between "Click or drag'n'drop" and "Android.zip" labels):
This is better than no feedback at all, but a message like
Whenever a ZIP archive is being uploaded (which, over a slow network, may be a lengthy process), a gray bar with rounded corners appears in the UI (immediately between "Click or drag'n'drop" and "Android.zip" labels):
This is better than no feedback at all, but a message like
or
would definitely be better.