When editing using the Mosaic Editor, any change done is stored in the .p4d file saved in the meditor folder (202558559). This folder is created in the selected project path when saving the mosaic by selecting Export on the right sidebar.
The selected Edited Mosaic overwrites the Mosaic generated at step 3. DSM, Orthomosaic and Index.
For more information about the project folder structure: 202558649.