Group upload failure notifications

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**Is your feature request related to a problem? Please describe.**
When the server is offline, upload failure notifications for group uploads stack up. This can result in dozens of repeated notifications appearing at once, which is overwhelming and not helpful.

**Describe the solution you'd like**
It would be useful to either:

Consolidate multiple failed upload notifications into a single notification summarizing the failed uploads.

Or implement a limit on how many notifications can appear at once for offline/group upload failures.