Find-A-Grave tidbit: Did you realize this? When you go out and volunteer to photograph a gravemarker and upload it to Find-A-Grave, YOU are the “owner” of said photo even though likely you don’t really have a personal interest in that person or their marker.
BUT if a person who does have a personal interest in that person or marker, they may (they should) ask YOU to either add some biographical information to the page or ask your permission to do it. If such a person/request surfaces regarding a photo you’ve uploaded to Find-A-Grave, you can ask that person (who is likely a descendant) if they want to assume management of that page??
Right along with that, if you want to take over the management of the Find-A-grave page for your ancestor, ASK. Fully 95% of the time the owner (who has no real personal interest, remember) will say yes. I did not know those details.