No longer able to hide photos synced from my laptop using the share and hide option or even the three dots

In the past, if I had a folder with synced photos from my computer/laptop that included some I wanted to keep private, I could simply select the ones I wanted to hide by clicking on them. A blue check mark would appear in the upper right hand corner.

Then I could hit the share option (upward arrow) and one of the options would be to hide. In this way I could hide many photos very quickly.

Now this share option does not exist for any of my photos (whether synced from my laptop or just recently taken).

There is still the option to hide a photo when you open each individual photo and tap on the three dots option, but this ONLY works for photos that I have taken with the camera.

It DOES NOT work for photos that are synced from my computer/laptop.

Does anyone know how to get this to work again from photos synced from the laptop/computer? I presume the same issue exists for iCloud photos, but don't know this.

Ideally I would have a way to replicate the original option to hide a large number of photos simply by selecting them without having to open each photo individually to reveal the three dot option.

Suggestions? Work arounds?