I've been accumulating a massive collection of print, negative, and slide images over the last couple decades - some from my own film photography days, but much of it is inherited from my parents. I plan to scan all of it and make it available online for extended families to enjoy.
I've been looking at both Amazon and Google photos platforms that would be "free" to me (as an already paying subscriber of various services). The one key thing I'm looking for though is the ability to share albums with others and allow them to either comment or more specifically, contribute to the metadata of various photos (e.g. where, when, who, what, etc) - as I dont have nearly any of the context and I'd love to empower (recruit) several of my long-retired aunts, uncles, cousins, etc who would not only enjoy the trip down memory lane, but would have the most likely chance of providing detail about each photograph that I would love to preserve for others into the future.
I'm not sure if either Google or Amazon is the right platform to make this viable - I'm open to other subscription platforms as well. Another key requirement would be the ability to export that metadata so that I can back it up offline in my local storage (where the original scans would also exist).
Any ideas?