Error Notification when URL send fails

[mikulik86]

Hello, first of all thank you so much for this awesome app!

I just have a small request. Could you please add a Notification in case when sending to custom URL fails?

Thanks in advance.

[mendhak]

I'm currently working on error notifications for when permissions get revoked or files fail to write, which are pretty critical. So I thought I'd visit this issue while doing that.

The core part of implementing this was actually quite easy f0d886a but I've reverted it now for the below reasons.

But when testing it I found myself not 'getting' the importance. For reliability, the auto send feature is what should be used, which records a CSV file and uses that to re-issue requests. What's the purpose of knowing that the Custom URL send failed, and what would a user do about it? In the errors notification I want to keep noise to a minimum so I'd want the failure to be critical. In this case I feel there is a workaround so I'd like to hear more around this, maybe there's something I'm missing.