Ah... thanks @enginewitty... just tried another... and it worked.

So AltYes doesn't actually share the content in the URL being shared, but rather just a link to the content (with a summary)?

hmmmm... I like that (and useful for so many other reasons)

... but is there a way to optionally NOT share a link to the original, but actually "cross-post" (i.e. repost or 'duplicate' the original images) from IG/Whatever, but allow editing of the original text?