Some interesting tips for managing your photographical contributions:
1) To know the total number of pictures uploaded, check your dashboard (the application Google photos doesn't show but number of albums).
2) To see your pictures shared via Hangouts, go to Picassa or use "https://get.google.com/albumarchive/" (this works for sent pictures only)
3) For pictures shared with you via Hangouts by others, use the following work-around:
- find the Picture in HO
- copy the link URL
- paste it in the address line of your browser and delete everything after "?pid" (these four characters included)
- enter and enjoy 😉