Pioneer Da-100Skf Silk Fabric Frame Photo Album, 100 Pockets Hold 4"X6", Lagoon Blue

is there a place to write a caption?

I have read this answer, however, I am still confused. When you open the binder, are the photos vertical or horizontal?

how big of a picture can you put on the front cover? 4x6? 5x5?

Are the photos held vertically or horizontally?