If I were to remove the "which is" or "that is" from an adjective clause, which type of adjective phrase is formed?

Example with adjective clause:

• Your pictures are stored in the Gallery which is accessible from My Dashboard.

If I were to remove "which", would the result be just an adjective phrase, if so what type?

• Your pictures are stored in the Gallery accessible from My Dashboard.

I want to say it’s an attributive adjective phrase, but I’m unsure.

..

I also played around with participles.
This is just a bonus question. Would the bold part be called a past participial phrase?

• Your pictures are stored in the Gallery found from My Dashboard.