Hello,
I don’t see any harm into adding this as long as it’s only possible with awaiting reports. Perhaps unnecessary at first sight, but this may actually help a little, and since the pros outweigh the cons by far this sounds alright.
This seems a bit useless. Just make sure you select the right and enough evidence when submitting a report. If you didn't add enough evidence you can just make a new report which is no big deal at all. I've never had the issue that I accidentally didn't add all screenshots I needed to.
I can tell you’re a more experienced user of the report website, but for a newcomer this may actually be helpful in a few cases. For instance, due to the new rule update you need to have your chat open when you take a screenshot of then offence. I didn’t know this at the time and read this after I submitted the report, if this feature existed I would’ve edited it in time.
Perhaps not as urgent as other suggestions but I truly see no harm in its existence, if this suggestions helps only 0.01% of the users it could still be added if there are no downsides to it, which there aren’t as far as I can tell.
Though I must say the approval of this feature is unlikely. It is so insignificant that it wouldn’t be worth developing, since the developers probably have higher priorities.
Never the less I like the idea, its just unlikely to happen.