Sharing Photos from Mac to external source (eg., Facebook, Shutterfly, 3rd party photo vendor)

Hello

In my Photos app, I have created various photo albums to best sort and organize, as follows:

[Year]\ [name of event, eg., Christmas 2025]

When working in Photos, this album structure allows me to easily find all albums. When in Apple Mail, and if trying to send photos, I can easily find the albums and attach the photos desired.

However, when working through Safari and with a 3rd party such as Facebook or Shutterfuly, when I browse to find the Photo Album that I want specifically, rather than seeing a list of Albums, instead I only have access to all my (thousands!) of photos. This was not always the case and I am not sure if the change is as a result of an OS update in the last year?

In my Finder window, I have "Pictures" which will only point to the Photos library and I have Photos which as noted above, displays every photo in my Photos app, not allowing album selection.

The only workaround that I could find was to export the Album wanted and then through the 3rd party, navigate to that specific folder and upload the photos. When working on a photo book for significant (albumed) events over a year, this process seems tedious.

Any help is appreciated.

Thank you,