I am running out of phone memory. 6.9Gb appears to be used by photos. How can I free up space?

[AC Question]

I am runing out of phone memory. 6.9Gb appears to be used by photos.

I cannot find these with my file manager to delete them.
Photos appears to see them but cannot display them when wifi off.
How can I free up this space?
(Note I have the removed theSD card !)