RootsChat.Com

I manage X’s test and am actively researching her tree for her – it’s a public AFT – so each earlier generation is researched and entered by me once I’m satisfied via appropriate source records.  I’ve already entered all sixteen 2xg.grandparents and have potentially identified but not yet entered the next thirty-two. Even though I’m pretty confident that only half are likely to assist me to pinpoint our common ancestors.  But beyond that (as our connection is likely to be a 4th or 4th g.grandparent) the circle gets very large indeed.  And all of those people will have been born in the middle of the 18th century or before.  Identifying even a majority by traditional methods is unlikely to happen.
I’m familiar with DNA Painter only as regards the Shared cM Tool – and I know little of WATO or Banyan, but gain the impression they test and evaluate various hypothetical links.  But unless I’ve really misunderstood their purpose I think I’d need to have already identified a hypothetical common ancestor – which is what I’m trying to do!

One of my DNA matches (‘X’ to preserve her anonymity) has only five other matches in common with me. I know who they all are, and they (and I) are all descended from the same couple – my 2xg.grandparents (so also our common 3xg.grandparents).  But X is not – she’s probably two generations earlier. I manage her test. Thrulines is essentially ‘top down’: pick an ancestor and the tool shows the matches that share that ancestor.  Can I run the tool in reverse, to ask it to show me which ancestor X has in common with me and our five other shares? If so, how?

Indeed.
That's exactly what I suggested doing. But as for amending the actual image - less happy with that, I'd prefer to do that to a copy, so the original is preserved as found.

I’ve a JPEG of a photo of a woman named Eliza Ann Roe (born in 1880 and died in 1954) who was my daughter-in-law's maternal great grandmother. I wasn't sure where I got this, but I suspect it was from a website, and so I presume was uploaded by a descendant who has the original and is, in effect, the ‘source’. But who is that descendant and what web address would link back to the image I downloaded?  Had I made a note at the time, how best could I have linked that data to the image file – preferably in such a way that they could not become separated?
A search on Ancestry’s public trees does in fact lead me back to the mage I downloaded, and I can see who originally posted the image – more than 12 years ago! But the question remains. How do I document the provenance of the photo?
I use Family Tree Maker as my primary record mechanism, sync’d to an Ancestry Family Tree. In FTM I can add a ‘Description’ to the photo to document the source, but that doesn’t appear to upload to the AFT – or if it does I can’t find it!