i have made a collection but when i try to remove pictures from gallery it removes them from the collection too. i'm new at this are the pictures suppossed to remain in the gallery and disappear when i add more. thanks for any tips.
I assume by gallery you mean the catalog of pictures.
The whole point of PSA SE is that you keep all your pictures in the catalog. Then you use tags to filter the catalog to find specific pictures and collections to create ordered views for particular projects.