Not sure if this is the right place for a feature request, but others might have thoughts on this, too:

Tracked mail costs extra (especially international) so for some my shipment proof, I've filmed myself depositing the shipment in a letterbox (with the shipping address visible); I figured that a photo of me holding the shipment half-deposited into a mailbox doesn't prove anything because I could still pull it back out.

Sadly, the shipment proof page only lets me upload an image, and there's no text box where I could provide an explanation / a link to my video on Google Photos.

Would it be reasonable / possible to integrate into the reviewers' workflow to provide a text box and/or a short video for the shipment proof?

So far I've only used this method for zero-credit exchanges which I believe won't get me banned even if the shipment gets lost, but it would be nice to be able to do this more commonly (including when posting parcels in an automatic parcel posting facility, which doesn't give me a receipt unless the parcel is tracked).