There is no need to "save" your image. Whatever adjustments you made are always there, but you can step back in history, or reset to the original (pre adjustments) if desired.
You can export if you want to product a copy in a different format ie jpg, or resolution etc.
|Dalmatian pelican by Avocet17|
from A big year - birds 2018
|Soup by Coolinarka|
|Off Piste Skiing - rest time by munte|
from Warren miller
|Snowflake by Tigor|
|Wet Rocks by Kukla|
|Flame On! by 6bender|
from - Flowers on Black -