Here's a handy document that explains how to send feedback (internal, private) directly from Slack to Uservoice which is handy for things like ISTE or being on-the-go: https://help.uservoice.com/hc/en-us/articles/360039334854-Working-with-feedback-in-Slack#h_b065d683-4d3e-432a-bcb7-0304b7951969

TL;DR: send a message in this Slack channel, click on the three dots to the right of the message, click on "Send to UserVoice" and then fill in the form (see screenshots) -- but read the doc because there are lots of options

(note: will keep testing though to see what the best flow is, especially on the UserVoice side)